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Another Apeks Quantum Failure September 9, 2012

Posted by Chris Sullivan in Equipment.
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My replacement Apeks Quantum failed less than a year after I received it. It’s great that I get a new one but it costs about $60 in shipping and handling each time so it’s getting to be pretty irritating. This time, it decided to start eating batteries. I noticed at the beginning of summer it needed a new battery even though it was only about 6 months old. Then again on last weekend’s dive it was too weak to dive it. I happened to have a brand new replacement with me and used it on the next day’s dive on the Oconto, but on the surface interval it was obviously dying again so I didn’t use it on the Kinghorn later than day and took it to Divetech where they said it could be replaced for another $60.

I think when I get the replacement I’ll sell it to someone who doesn’t read this blog and maybe even spring for the new Shearwater Petrel. That would give me two functionally identical computers and I would no longer need to carry decompression tables.

Apparently the Quantum is made by Seiko, and is also rebranded under several other manufacturers’ names including Dive-Rite, although though don’t seem to carry it any more but have a 3-gas model that looks similar. The Tusa Hunter looks identical, but the Cressi Archimede II is a bit more stylish but recognizably the same design. Cressi always seems to be more stylish if you’re into that –  I’m not – and their motto is “Scuba Diving in Style”.

I’ve reset more bent Quantums (or equivalents) than I can count, usually because the diver using it as a backup computer didn’t figure out how to switch to the deco gas. That happened to me once too. The trick is to hold the left button down for longer than you think is necessary. If you don’t hold it down long enough, it will switch back to your back gas.

The other Quantum trick is that after a reset it goes into metric. If you dive in Imperial units you need to go to the DIVE/GAGE screen and hold the left and right buttons down for 5 or more seconds.

Diving the Oconto September 4, 2012

Posted by Chris Sullivan in Dive Log, Shipwrecks, Technical Diving.
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The Oconto lies in US waters a little upriver from the Gananoque bridge. It is actually just across the channel from the Vickery, and it was suggested by the owner of DiveTech that we could actually cut across the bottom from the Vickery to the Oconto by heading in the direction the Vickery’s mast is pointing. We decided to wait until next year for that adventure. Crossing a current at 190-200′ on air is not something to be taken lightly.

After finding my Apeks Quantum dead the day before, I installed a new battery, and set it up for gauge mode (bottom timer) with decompression tables written out and stowed inside a ziploc bag in a pocket on the belt of my harness. My primary computer was the ever-reliable Shearwater Predator, with Rob diving his Cochrane (plus a Quantum) and Matt using a Uwatec.

After verifying that the large shoal marker was the correct one (about 12′ square at the base) we approached in the dive boat and the three of us dropped into the water without anchoring. Like the one near the Daryaw, an Osprey was in its nest on the top of the marker and didn’t seem very happy to see us. We were also a bit downriver when we entered so we had to swim against the current wearing our doubles and stage bottles which was a bit of a workout. The bottom was shallow around the shoal marker (think about it!) and we were able to stand up and catch our breath before submerging.

We were told there was a line leading down to the wreck, but the only line we saw at the marker ran around about 1/2 its perimeter. We were also told we would go down to 30′ then up again to 10′ before going down the wall. This was also wrong, a fact not lost to us when we hit the first ledge at 54′. There is a lighthouse across the channel a little bit upriver, so our team of 3 headed off in that direction with Matt in front using his compass.

Using the narco stops plan we came up with the night before, we stopped at that ledge for half a minute or so. At 74′ I saw a line attached to a block and signalled it’s presence to Matt and Rob. We stopped again at about 100′ for another narcosis break and planned to the same at 150′ but instead ran into the Oconto at 141′ and did it there. The change in light level below 100′ was very apparent. We headed down the port side of the wreck, away from the wall and swam around and under the spars extending into the channel. Further down the wreck, and towards our maximum depth it closed in further and Rob, who was still under the spars at that time decided to turn and come to the outside at just about when I started signalling him to do just that. Wreck penetration at 175′ on air is not very safe – but without a line and on the first visit it’s just foolhardy, and I’m glad that I don’t dive with fools.

There was a large boiler on the bottom, and a couple of anchors that were nestled together. We circled around the end (or what we thought was the end, we think it actually goes further and I’ll let you know the next time we go there) and we were back at the starting point 15 with minutes into the dive. Starting at the port side, with the current pushing us along was the correct decision, as there was less current on the return trip when we were swimming between the wall and the wreck. Even so at one point I saw Matt swimming fairly hard and I cautioned him to slow down as I was concerned about his air consumption.

Now back at the bow, we checked our air and had enough left (with reserves in place) for a little more exploration and agreed on 22 minutes total bottom time (the initial plan called for 20-25 minutes). So we played around the first 30′ of the bow about more before starting an fairly uneventful ascent bang on our planned time. Unfortunately Matt cut a small hole in his dry glove hanging on to the Zebra Mussel-infested rocks, but at least it gave him the opportunity to give Dive-Tech some more business. I’ve been with lots of dry suit divers who have flooded their gloves and it’s one of the reasons I use wet gloves, even though it sometimes limits the temperatures I can dive in.

Rob and I on the other hand spent the 10 minutes or so on the 10 foot stop feed Zebra Mussels to the Gobies, and even a small Perch got into the action. We surfaced right where we started with huge smiles on our faces and our dive boat about 20 feet away. A fantastic dive with none of the narcotic weirdness of the previous day.

Dive time was 56 minutes, 22 minutes bottom time, with 18 minutes of that on the wreck. Maximum depth was 178 feet.

Recreational Diving with a Shearwater Predator March 7, 2011

Posted by Chris Sullivan in Equipment, Technical Diving.
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My second Apeks Quantum developed a problem last summer. The first one just died, but this one has developed the common problem (that my friends have seen) which is that the depth gauge becomes unreliable. Mine will suddenly jump to 10 feet shallower than I am, beeping mightily about the astronomical ascent rate. So while I’d normally take the Quantum on a trip where the water is warm and clear, with purely recreational dives, I elected to take my tech diving computer, a Shearwater Predator, instead.

The Predator is a great dive computer. Mine used to be a Shearwater Pursuit and was upgraded once the Predator was introduced. The main differences between the two are the OLED colour display (vs. LCD monochrome) and the Bluetooth communications to the (free!) logging program (vs. Infrared). Both features make a big difference to the operation of the computer, especially the nice bright OLED display on someone whose close-up vision isn’t quite as good as it used to be due to Presbyopia.

Predator’s have technical diving features like multiple mixed gases (5 gases for the open circuit version, 5 more for the close-circuit version), flexibility for decompression schedules, underwater gas switches and changes, etc. It lacks features that recreational computers have, especially the audible alerts and the safety stop counter. I don’t mind missing the audible alerts. I’m good at scanning my computer and other gear. Also, I like to guess what I’m going to see before I look at the computer and my air supply, so I develop a good mental picture of my situation.

I use the Predator with a conservative decompression algorithm (GF 30/85, which is actually the default).  The Quantum, at least for the NDL calculation, is less conservative and my diving buddies figure it’s around GF 88/88). The tough guys at in the dive club who use Cochran Computers have them set to about 100/100, by the looks of it. The 30/85 setting means that it will go into mandatory deco stops sooner than most of its recreational counterparts. So unlike the rules that new divers are given, if you use a computer like this you either have to abide by a very short NDL or accept the deco stops.

It’s probably no surprise that I usually do the latter. In the 18 dives I logged in Cozumel I didn’t go past 6 minutes total decompression obligation. Most of the time it was 2-3 minutes, sometimes nothing. It is my belief that a 3 minute 10′ deco stop with a conservative algorithm is more or less equivalent to a safety stop. If miss, the chances of DCS are greater but that’s also true if you miss the safety stop. So in effect, I’m just getting the additional discipline of a safety stop that my computer calls mandatory. Once I’m done the stop(s), I’ll stay a while longer to get some additional safety margin or surface – slowly of course.

Getting well into deco is an entirely different matter. 5 minutes is about all I’ll do with recreational equipment. If I have to escape to the surface I’m probably going to be OK, which is as much as you can say for missing the safety stop on a less conservative computer. Any further pushing of the limits means carrying additional redundancy to make sure that I have the means to complete the decompression under all foreseeable circumstances. That’s why we have technical diving training.

Disclaimer: This is what I do. You need to understand all the facts and risks to make your own decisions about what level of risk is acceptable to you. I certify that this level of risk is acceptable to me at the time of writing, and that’s all.

How to Reset an Apeks Quantum October 22, 2009

Posted by Chris Sullivan in Equipment.
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Somebody searched for this question and it’s an easy answer so here it is.

There’s a grey button on the back of the unit. Find something pointy but not sharp and use it to hold the button down for a second or two. There, you’ve done it.

But wait, you’ve just reset your computer. You will have to reset the time (press the mode button until you get to the TIME screen, and then use the left and right buttons to set the time – unless you’re over eighty you should be able to guess how to do this).

You will also have to set your computer to Imperial from Metric if that’s the way you dive. Use  the MODE button to go to the DIVE screen, and hold both the left and right buttons down for about 5 seconds to move from Metric to Imperial.

That’ll do it. You’ll have to reset your alarm preferences and enter your gas mixes as well if that’s what you need. You may also want to set it to fresh water from salt (also on the DIVE screen), and if you’re like me and using it with tables from DIVE to GAGE mode.  Logged dives will not be erased.

Almost Perfect Dive on the Arabia August 24, 2009

Posted by Chris Sullivan in Dive Log, Shipwrecks, Technical Diving.
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The second dive of our visit to Tobermory on August 15th, 2009 was better than the previous dive of the same day on the Forest City. The three technical divers, Rich, Andrew and me entered the water first and quickly descended to the concrete block positioned off the starboard bow. After crossing over to the wreck, we rounded the bow just under the long jib boom, which protrudes far beyond the deck and is one of its most prominent features.

Heading sternward on the port side at around 100′, I looked at my computer for the first time and it read “High PPO2”. Instantly realizing what was going on, I switched the active gas over to my back gas, as it was still set to my deco mix of EAN50. This is something I have to remember about the Shearwater Pursuit that is different from my Apeks Quantum. The Quantum will revert to “Mix 1” at the beginning of a dive, while the Pursuit will remain on the last gas used. I thought for a while about how I would handle my decompression obligation, if any, after having the first 5 minutes of the dive miscalculated. I decided that I would slow my ascent, switching over to EAN50 as soon as possible on ascent, leave the computer on its air setting for the ascent, make a safety stop, and not exceed my buddies’ own deco schedules. Having decided on that plan, I continued with the others.

When we got to the stern, I noticed a long mast heading almost straight back (a little toward port) going off into the distance. It looked to be about a foot (30cm) in diameter, and at the end I could see another pole or perhaps a line leading away from it. I learned later that this is an alternate descent point to the Arabia and what I’d seen at the end of the pole was indeed a line. An impressive sight and definitely a testament to the wonderful visibility we had that day.

The other highlight was when we got back near the bow. There are two large anchors easily seen on either side of the deck, leaning against the side rails in the same position as they were before the ship went down. Between them there is a large windlass. I had heard there was a third anchor somewhere on the wreck and I signalled to Andrew to ask him if he knew where it was. He didn’t, but he looked around for a bit and noticed it nestled on the deck amongst some other equipment, hidden in plain sight. Once you knew to look in the right place for it, the anchor shape was quite clear. Unfortunately Rich once again had cold hands and missed it because he left early.

After that, with 27 minutes bottom time Andrew and I made an ascent totalling 9 minutes to the surface, most of which breathing EAN50. With Andrew’s computer clear and a conservative ascent, I was satisfied that I’d decompressed sufficiently to exit the water, which at the bottom was only 6C (42F). After the dive, I noticed the CNS clock on my computer at 129%, so actually diving to that depth on EAN50 is definitely not advisable.

Back to the Forest City July 14, 2009

Posted by Chris Sullivan in Dive Log, Shipwrecks, Technical Diving, Training.
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London, Ontario, where I lived for 17 years, likes to call itself the Forest City, but there are several Forest Cities in the Great Lakes region so the ship could be named after any of them.

This time, on August 8, 2008, armed with my Tec Deep certification and full technical gear, I could “legally” venture below 130 feet.  Even so, this third expedition was my shallowest dive on the Forest City to date, as I with with some other guys doing simulated decompression only as they were still in training. I dutifully cut short my dive and “decompressed” for 15 minutes on EAN48, with only 1 minute of actual decompression time.

The water temperature at depth was a mere 6 degrees Celsius (43F) but I was warm enough in my dry suit. It was the happy time when both my Apeks Quantum computers were working so I was wearing both rather than relying on tables for deco. At around 130 feet deep I noticed that there was a hatch in the middle of the deck. I’m going to stick my head in that to see what’s in there next time I dive it, which will be in August, unless I am accompanying students, of course.

Total dive time was 46 minutes, and I burned my doubles from 2900 to 1500 PSI, and my AL80 deco from 2900 to 2100 PSI. I took some photos with the Nikonos but as I mentioned some time ago the film was destroyed while I was in Pensacola.

Wreck Training on the Daryaw July 7, 2009

Posted by Chris Sullivan in Dive Log, Shipwrecks, Technical Diving, Training.
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This dive, on July 20th, 2008, was strangely enough one of my favourites of the season. The mission was simply to hold my position inside the wreck of the Henry C. Daryaw, located at around 90′ below the surface of the St. Lawrence River near Brockville, and make sure that the wreck diving students didn’t go further into the wreck than they were supposed to, and to be there to assist in case of problems.

Simple enough, though we had 4 buddy teams come through twice each, giving each diver a chance to lead the penetration and lay their penetration line. I had done the same course the year before and this was only my third time inside the wreck. Later that same year, in September 2007, I’d qualified for my technical diving certification, and early in 2008 my Divemaster rating. This gave me the opportunity to assist with the dive, as we were required to stay under for so long that multiple tanks, gas switches and decompression were all required.

Brad was instructing with Dave assisting, and Andrew and I were the safety divers. Andrew, an AI but not quite finished his technical training and also using a high capacity single cylinder, pulled the duty to shuttle students from the buoy line to the door where they were to enter. As mentioned earlier, I got the role of blocker at the turn from the passageway leading astern on the starboard side of the wreck to an mechanical room amidships. It was there I was to remain for two hours. To shorten our decompression time, we dived Nitrox with 35% Oxygen.

Dave went it first, but he thought the door to the mechanical room was closer to the entrance than it was. I was following him, with Brad behind me. Unfortunately, Dave thought I’d gone too far and Brad thought (correctly) that I hadn’t gone far enough and I found myself being shoved from both directions. This resulted in a silt-out with near zero visibility. Dave finally figured it out and Brad got me to where he thought I should be, and there I was feeling pretty lonely in complete isolation without being able to see anything. I held on to my stage bottle for comfort knowing that I had enough air to last a long while and concentrated on controlling my breathing.

I remember getting that “what I am doing here?” feeling that I got the year before when I first went into the wreck. This time I had no penetration line and in the complete darkness I felt isolated and alone. Brad, who’s been in there a bunch of times, came over and I saw his hand well enough to see his OK sign. I gave him one back, but he had to reach out and feel my hand to know that. By that time, the silt had settled very slightly and some outlines became visible, and I started to be more comfortable.

After a while I could see Dave in his position, or at least his light, and several minutes later the first pair of divers came in. They had the hardest time because the wreck still had lots of silt stirred up. As their light approached, I pointed in the direction of their destination while shining my light on my hand. They got the message.

A couple of times I had to direct divers through the correct  door. Bruce in particular seemed really set on going through the next door down and I had to push him through the right one (which was the one on the left).  There was a long time between divers – I think we’d allowed too much in the planning of the dives, so a lot of the time was spent waiting around. The depth was around 85 feet (more on my feet, less on my head), so I started racking up deco time pretty fast in the second hour despite the Nitrox. After my doubles dropped to 800PSI, I clipped the AL80 that had been sitting at my feet the whole time onto my BC, and switched over,  taking it down to 500 PSI by the time I’d finished with it.

The deco stop was the longest I’d ever done at about an hour, based on my Apeks Quantum‘s calculations. Most of this was at 10 feet. We weren’t carrying any richer mixes with us so I couldn’t accelerate it. Dave and Brad, using Cochran dive computers which have pretty aggressive profiles, were done in about 20 minutes. And so I sat. Steve, our on-board Divemaster, came down to see how we were doing. He was there when Brad’s fin came off due to a broken strap or buckle or something and he went to fetch it. I then saw him swimming hard back toward the line in the current, but making little progress. I held out my had and pulled him back in (Steve swears I extended just one finger, which I may well have done, but I don’t remember that).

We hung off the buoy line while we off-gassed. Most of the time I had my eyes closed and lying on my back,because my AL80 stage bottles were near empty and getting buoyant. Three hours and 3 minutes after getting in the water, I was back on the boat. I’m looking forward to doing it again.

Recreational Pursuits July 2, 2009

Posted by Chris Sullivan in Equipment, Technical Diving.
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I received this email from one of my fellow Shearwater Pursuit owners. There were 5 of us in all for the first order from my dive shop, including 1 SPOTCE for our course director who has a KISS rebreather, a SPOT for me for technical diving, although I’m not yet Trimix certified, and 3 SPONs for the recreational guys (2 instructors and a divemaster).

Guys

After talking with Andrew who after a NDL dive wearing the Shearwater (SPON) and the Apex Quantum found that the Shearwater to be more conservative than the Quantum I started to look at the GF that were preset (30:85) and while that might be appropriate for decompression dives I think that may be way too conservative for deeper NDL dives. It would make sense to me that a GF setting of 85:85 for those in Navy Seal shape or down to 80:80 for the rest of us. If I understood the literature this would give us a 20% safety margin from the theoretical M-values, please wade in with your thoughts. There is the trial & error method comparing other computers while on a dive as I would like to have my Shearwater to be in sync with my Quantum or the Cochran!

I had some questions that I thought I could get answered (found at the bottom of the email) that I sent to Shearwater at 9:45 pm on Canada Day, attached is their response received 25 minutes later WOW. Please look at my questions and then their answers.

Cheers

Marty

——- Forwarded message follows ——-

From: Shearwater Research <info@shearwaterresearch.com>
To: <deleted>
Date sent: Wed, 1 Jul 2009 22:10:17 -0400
Subject: SPON information

Hi Marty,

Happy Canada Day!

We do not have an official registration process. To receive information and news about updates and what’s new, please sign up for our newsletter on our website.

As far as the Fischer plug is concerned, loop the wire thru the slot in the bracket and crimp it down with the little attachment that’s in the bag. Or, loosen one of the screws that attach the bracket, loop the wire around that and tighten down. The plug is a friction fit and would be very difficult to pull out when it’s under pressure. In any event, the Fischer connection is hard potted and will not leak even if the plug is left off. The plug is to prevent the pins from salt water and eventual corrosion.

When speaking with Brett the other day, I mentioned to him that we are coming out with our own dive log program that will be offered free of charge. The third party program has caused our customers too many problems, we can no longer recommend it. Not to mention that he’s increased the price without advising us.

We are definitely targeting technical/decompression divers but are always thrilled when a nitrox diver purchases one of computers! Our factory default setting is 30/85. That’s a good conservative profile that works well for most folks, including recreational divers.

I’ve passed on your offer and information to Bruce. We are growing rapidly with lots of new ideas and plans for the future.

Thanks for buying one of our computers, I hope you enjoy diving with it.

Regards

Lynn

From: <deleted>
Sent: Wednesday, July 01, 2009 6:46 PM
To: Shearwater Research
Subject: Contact Form Notification

Contact Form Staff Notification

A New Contact has signed up through your contact form

A Contact has signed up. Their information is below:

<contact info deleted>

Comments: I was one of the instructors who purchased Pursuit SPON from Colt Creek Diving in Newmarket Ontario the other day. I do have a few questions regarding the computer and it’s operation. 1) I did not see any registration forms nor did I see an online registration process. Is there one? 2) The Fischer connector SS cover, where is the recommended attachment point? 3) In your pricing information the HHS Software Corp Dive log manager is quoted at $25.00 CDN whereas on the HHS Software Corp web site the price is $45.00 US. Can we purchase the software directly from Shearwater? 4) When the computer is to be used in recreational diving (No decompression) are there any guidelines or recommendations for setting the Gradient Factors? I have looked at the recommended literature but it seems that all are discussing decompression diving. I look forward to your reply. It is nice to see a Canadian Company engaged in this type of specialty research. I am electronic PCB designer by trade and should the need ever arise I would be pleased to assist in the development of your product.

Deep Dive Planning April 28, 2009

Posted by Chris Sullivan in Dive Log.
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The best of plans can go awry, some by a little, some by a lot. Other than the extra 2 minutes at depth, a result of not being able to find the way into the escalator and compensated by shortening the next segment of the dive, I thought we were pretty close to our plan. Well pretty close is right, but not by any means on it.

I’ve charted both the plan and the log of the Oriskany Dive #2, which I described in this blog a few days ago. The blue line is the actual dive (painstakingly recorded from the dive profile on my Apeks Quantum, which spits out a new number every second representing 30 second intervals of the dive), while the black line is the plan.

The first part I expected, we had a slower descent than planned. I warned the others that this would be the case when we planned the dive, as it always takes a little time to go through the bubble checks and we never rocket down to depth (well, hardly ever), but you can see we’re almost 8 minutes into the dive before we start the descent down the escalator from 150 to a maximum depth of 172. We had planned to assemble at 100 and then 3 minutes into the dive go down the escalator, so at this point we were 5 minutes behind schedule. Given that there were 5 of us, and none of us had done this tour before, it was inevitable that we’d be late.

Then you can see that we were about 2.5 minutes behind getting back to the deck of the ship, and above our next planned depth of 150′. After that we were pretty good. We were again late on our ascent to our deco stops by about 2 minutes. Now the dive plan as shown ignore ascent time, which would have added 5 minutes to the dive, so I can account for some of that there, but at 40 feet we’re considerably behind and I’m not sure why. One theory I have is that my watch lost time – I missed my train from work on the first day back and found my normally precise watch (1 second a month) had lost 3 minutes. I think there may be a problem with it under high pressure, even though it’s rated to 200 metres.

The stops also really look unsteady. They were crowded and I was constantly repositioning myself but I think I can still do better. Obviously more practice is required. Fortunately both the gas plan and the computer were conservative so I had a very extended deco courtesy of the computer, and still arrived with almost half my back gas remaining.

I don’t have the dive plan for dive #1 although I’m trying to get it from one of the other divers. I’d like to see how that one went.

Diving the Oriskany – Day 2 April 24, 2009

Posted by Chris Sullivan in Dive Log, Shipwrecks, Technical Diving.
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The weather was significantly improved by the second day with warm temperature and clear skies. We picked up our doubles at MBT divers and headed out to the Marina to load up the boat. Brad and Ken had decided not to dive that day. I supposed I’ll find out why later but at that point all I knew was they’d decided to give it a miss, along with Jesse who ended up not diving either day. Rich wasn’t feeling well, so only 9 passengers set out that day with the captain and crew of the H20 Below for another trip to the Mighty O.

Mike had used two Apeks Quantum computers the day before, but in the evening one of them stopped working completely, in a very similar way to one of the ones I used to have. It was the older of the two (like mine) and continues the pattern of these computers having a limited lifetime.

The trip out was much more pleasant than the day before, with waves only about half as high. We spent the first half hour watching the Blue Angels, who make their home in Pensacola, practice their aerobatic display along the coast. There were 6 airplanes flying, and while 5 of them were in formation we lost sight of the other one. Next thing we knew the 6th plane buzzed (ok he was probably at least 500 feet) our boat from bow to stern. Most of us were facing astern and the high speed of the plane ensured we didn’t hear anything until it was almost overhead. Way cool.

Blue Angels in the distance as we head out

Blue Angels in the distance as we head out

The rest of the trip was spent planning the dive and preparing the gear. Our plan was to drop down a little past the top of the tower at 100 feet, then to deck of the carrier at 150′ and proceed through the middle door of 3 situated in the tower on the port side. The tower is on the starboard side of the ship so these doors face toward the deck. Through the door is a small room, with another door on the opposite wall. Through that door is an escalator leading down toward the hangar deck going toward the stern. At the bottom, a left turn leads outside to the starboard side of the ship, while turning right goes down a few steps and into the hangar, where we planned the maximum depth at 180 feet.

The plan then called for us to swim across the hangar to a large opening where one of the aircraft elevators was situated, ascend to the flight deck level, and swim back to the tower and look around for a bit at 150. We were then to proceed up and explore the navigation and/or flag bridges at or above 135 feet, before ascending to decompression depths. Dave was to lead the dive with Pete and Andrew following, and Mike and I in the rear.

Even when the boat stopped there was no appreciable nauseating movement, so getting ready and into the water was a breeze. This time I entered with the deco tank already attached and slipped down with Dave to 100 feet shortly afterwards. Pete and Mike were waiting there and while Dave headed down to the deck quickly I stopped for a minute to take a few pictures of the other divers. Dave gave me the hurry up sign so we all dropped down to the deck at 150. On the way I tied my digital camera to a rail because it was only rated to 130 feet. I’d thought about exceeding it’s maximum depth but thought the better of it. It took us longer that we’d planned to find the room. The first problem was that there were more than 3 doors, so picking the middle one wasn’t a simple as it looked on the diagram (is it ever?). The other problem was that it was set it my mind that the door in the opposite wall would be directly opposite the entry way, while in reality it was towards the right. If you go there, look for a small room (maybe 8×10) that has a door on the opposite wall near the wall on the right.

Mike descending from the 100' meeting point

Mike descending from the 100' meeting point

We all went through the door without problems, and even though I was fourth all the divers had great buoyancy control and things hadn’t been stirred up. I’m glad to report that Mike, who was fifth, reported the same thing so I can also give credit to myself. It was a great little tour down the escalator, and we got to the bottom it was reassuring to see the light coming in from the opening on the left. We turned right and went down the stairs to the door for the hangar deck and to my surprise there were a bunch of orange cables hanging across the entrance way. This of course immediately raised caution signals in my head but I soon realized that they weren’t really in the way, and that some of the team were already through without incident. I remember thinking that noone told us about them, which I thought was strange.

Andrews descends toward the flight deck

Andrew descends toward the flight deck

Reassured by the sight of the opening on the opposite side of the ship, we swam through marveling at the view. My new UK C8 LED Plus light illuminated the inside quite well, although only a bit at a time. If I’d taken notes I might have recalled some things about what I saw on the inside but I suspect that I only have a general impression of what was there due to the effects of narcosis. That impression, however, was great – it was a lot of fun looking around inside and I wish we’d had more time. The water temperature inside was 20C (68F).

Deepstop at the back of the tower

Deepstop at the back of the tower (note the new mask)

The dive plan beckoned, and due to the delay we were late leaving our maximum depth by about 2 minutes. Our delay wasn’t catastrophic though, because it had occurred while looking for the entrance at our planned depth for the next phase of the dive, so by returning to our scheduled run time for this segment we made up for the extra time. In any case I didn’t go deeper than 172 feet, and I don’t think the others did either. We looked around the tower taking some more pictures. I noticed everyone was well above the planned depth which was too bad as I wanted to look around the navigation bridge, but I had to stay with the team. The final 10 minutes ran out quickly and we ascended for the long decompression of about 40 minutes.

Barracuda lounge on the tower

Barracuda lounge on the tower

Like the day before, I used a Jon line for the last deco stop. This trip was the first time I’d used one and it was definitely a great help on a crowded stop. About half way through the deco the direction of the current moved almost 90 degrees and the temperature dropped slightly, portending the changing conditions above.

Damsel fish makes its home in the wreck

Damsel fish makes its home in the wreck

When we got back on the boat the seas had grown, and we had to be careful not to hurt ourselves on the ladder. I climbed back on with the deco bottle still attached. Despite the rougher seas, I felt great through the whole trip and even had some of the forbidden hot dogs (I never eat hot dogs, these were probably my first in more than 20 years) on the way home.

Oriskany's Number - 34. Note size of door between the digits

Oriskany's Number - 34. Note size of door between the digits

It was bumpy though. At one point we hit a wave about twice as high as the other which slammed me on the floor. While I was getting up we hit another and one of the crew landed on my foot and came close to breaking my big toe. It swelled up later making me thankful for the cruise control on the drive home. Even that couldn’t dampen my enthusiasm. I helped myself to another hot dog, laughed off the pain, and kept talking about the dive. I recalled a thing I’d read on the wall of the lobby of the hotel attributed to the US Marines that said “Pain is weakness leaving the body”.

Daving just hanging out on deco

Dave just hanging out on deco

The boat’s divemaster, Rich, was surprised to hear about the dangling cables. He said they’d been attached to the ceiling and must have come loose recently. He’s dived the wreck over 200 times and knows what it’s about. We’re just beginning, and I hope before too long I can go back for longer to explore it more thoroughly, although it would take years to see the whole thing.

After one stop for food and another at the dive shop, we were quickly underway for our trip back to Canada, and less than 19 hours later, at 10:30AM on Wednesday, we were home.

Overall, I’d give the trip an A+ based mostly on this second dive, although I can’t complain about the first – it was just getting there and back which was the problem. It was definitely a great experience. Despite the expense, long drive, seasickness, sore toe, and lost gear (a hat, a dive light and a library book), it was well worth the while and a real adventure. Living the dream, man. I’d also give an A+ to the dive shop, boat operator and crew. They struck the right balance between helpful and letting us do our own thing.

I used a bunch of new equipment, including new fins, my primary light and the Scubapro Spectra mask. They all worked great and I didn’t notice the mask, which is all I could ask for- both comfortable and transparent.

Here’s the decompression schedule using Buhlmann ZHL-16B algorithm with 30/85 gradient factors, which provided a good deal of conservatism. The gas rate was purposely set high to be conservative enough for the less experienced technical divers.

Left side on Air, Right side for EAN50

Left side on Air, Right side for EAN50

Depth Time O2% Start End PPO2 Gas Rate Gas Reqd GF% MVal% CNS% OTU’s
100 3 21 2 3 0.85 0.8 13 0 16 1 1.35
180 7 21 4 11 1.36 0.8 41 0 14 5 13.84
150 10 21 12 22 1.17 0.8 49 0 35 11 27.94
135 10 21 23 33 1.07 0.8 49 0 44 15 39.67
70 1 21 35 36 0.66 0.7 2 30 68 15 41.69
60 1 50 36 38 1.42 0.7 4 46 73 16 43.44
50 2 50 38 40 1.26 0.7 4 54 77 17 46.78
40 3 50 40 43 1.11 0.7 6 61 81 19 50.73
30 4 50 44 48 0.96 0.7 5 69 84 20 54.78
20 26 50 48 74 0.81 0.7 29 77 87 26 72.17
0 74 85 93