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Lake Simcoe Temperatures July 29, 2018

Posted by Chris Sullivan in Dive Log, Ecology.
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This chart is from Shanty Bay Ontario in 2017 and 2018 showing temperature (in Celsius) vs. Depth (in metres). I’ve only dived there twice this year so most of the graphs are from 2017 running from May until late November. The seasonal variations are quite apparent. In the late spring, the surface is cool at around 14C, warm enough to get students in the shallow water in wet suits. Throughout the summer, the water warms up unevenly, with the bottom remaining quite cold at 7-8C as it warms up very slowly, but the surface gets quite warm and nice in a wet suit down to 10m or so, depending on the suit, the length of the dive and whether you’re wearing a hood.

In mid to late September, the thermocline disappears, and the temperature is more or less independent of depth, as the two horizontal lines depict. Those two dives were relatively shallow so unfortunately I can’t show the effect all the way to the bottom, but from what I’ve read the relatively warmer water extends to the maximum depth of the lake. Also of note is the slightly more than 10C drop between mid September and late November, with the overall lake temperature almost as low as the lowest temperature I’ve recorded at the bottom.

In 2018, on 2 dives 4 weeks apart, the surface has warmed up a full 4C, whilst the bottom has increase a mere 0.2C. The fall seems to be a good time to dive Simcoe, when relative constant temperatures even at depth make excursions to the bottom more pleasant, although somewhat at the expense of the warmer wet suit conditions at the shallower depths. So here’s an update from my earlier chart with more data from last November onward. All temperature data is from my AP Inspiration CCR log.

 

I’ve also compiled some temperature data for Tobermory wreck diving. Stay tuned.

Exploring the Eagle May 16, 2016

Posted by Chris Sullivan in Dive Log, Shipwrecks, Technical Diving.
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Once again with Conch Republic, we headed off to the Eagle for the second and final time of the trip (the previous time we went there after deciding not to dive the Duane due to current). Joe and Rob were on their rebreathers with me on my doubles. Descent was uneventful and as usual I deposited my deco tank in a crevice on the wreck near the stern descent line.

Joe led the dive. We headed for the top of the superstructure on the stern, entering the wreck on the starboard side which was near the ocean bottom. We entered a non-descript room and Joe headed through a doorway, but unfortunately left a fair amount of silt behind. Unwilling to enter in zero visibility, I waited, illuminating the doorway with my dive light in case Joe was having any difficulty finding his way out. Within a minute he reappeared and we headed in a different direction exiting the forward end of the superstructure.

There we saw a Goliath Grouper just inside the wreck. There were some divers about 10′ above us and I tried to get their attention so they could take a look at him, but none looked in our direction. We then started wondering where Rob had gotten to so we went back to where we entered the superstructure then back to the line to look for him. We saw him 30′ or so above us signalling “OK” with his dive light, finding out later that he lost most of his diluent supply getting through the first door and decided to bail out. I’m glad we saw him and didn’t have to search the inside the of the wreck.

Atlantic Goliath Grouper

                                            It was bigger than this one

After doing a lap around the bow section, we returned to the stern and slid back in near the prop. You have to get low to the bottom to do this, and the interior is prone to silt so good wreck penetration skills are needed. 2 years ago we were swimming through the same spot and it started to silt up, prompting me to quickly exit the way I went in. This time was much better and we went sideways through a hatch (or maybe just a hole) into the very bottom of the ship, where there were reassuringly several large exits, although not much else to see. After this we went back to the line and ascended – and as usual Joe was finished his deco about 3x quicker than me.

Once more to the Spiegel Grove May 13, 2016

Posted by Chris Sullivan in Dive Log, Shipwrecks, Technical Diving.
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The last deep dive of the week was once again on the Spiegel Grove. Did I want to dive the same wreck 3 times in a week? Hell yes. I love that dive. This time four of us, Rob, Jody, Joe and me all together exploring levels 1 and 2. Level 2 is perhaps the more interesting one as it has the mess hall and the workshop, which has a grinder, planer, drill presses, lathe, hoists, workbenches and welding equipment. No-one seemed to have much trouble getting through the doors this time and we didn’t have any bailouts.

Near the end of the dive we were in the workshop when through a doorway we saw a large (no, like, really really big) Goliath Grouper hanging out. We watched him for quite a while but he eventually swam away slowly. We followed after him, descending through an oval hole and under the deck that overhangs the dry dock area. It looks from the plans like the hole once housed some kind of smokestack, but in (not 20/20) hindsight I’m a little fuzzy on which deck some things were on. The plans don’t show the stack on the workshop deck. It looks like once through the hold we swam out from under the deck on which the 3″/50mm guns used to be mounted, just before getting to the 50 ton cranes.

To be honest even though I surface with the feeling I was really getting to know the layout of the decks, in retrospect I’m not entirely sure what was on each deck, except for the mess hall and the machine shop. When I look at the plans I can’t reconcile everything with what I remember. Maybe narcosis is factor, or maybe the ship was reconfigured after the plans were drawn.

We also came upon the “Top Dog” floor mural in one of the hallways in the approximate centre of the deck, which I’d not seen before. It’s easy to overlook, being in a nondescript hallway running across the deck, and partially covered in silt.

TOP DOG - USS SPIEGEL GROVE (Floor Mural)

That was the best dive of the week, although I really like to go into the below decks again where it’s necessary to run guidelines. I’ll have to wait for my team members to get a little more time and confidence on their rebreathers before doing that again.

Shallow Waters May 8, 2016

Posted by Chris Sullivan in Dive Log, Shipwrecks.
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Wednesday turned out to be a disappointment followed by a decent shallow water dive. Once again we were to dive the Duane, and once again the current was way too strong. Like the previous time, we headed over to the Spiegel Grove only to hear of ripping currents there too, so we gave up and the boat took us to the wreck of the Norwegian merchant freighter Benwood, a wreck of a wreck lying in about 35′ feet of water. The Benwood sank after a collision, and then, according to our boat crew, the US Navy used it for target practice , so not only are there a few bombs lying around the site a lot of the metal is twisted beyond recognition. The Wikipedia article on the Benwood states that her stern section “seems to have been mostly obliterated by explosions of an unknown type”.

I dove with Rob, who’d recovered from his cold enough to dive. We took our time examining the wreck. Lots of time, actually, as my total dive time was 120 minutes. Rob logged 115 minutes but I explored for a few minutes below the boat so I could come up with 120 minutes on the computer. My reward was spotting a cluster of 4 lobsters. I’d had the best fill of the week so far so even with the length of the dive I still came up with 1000 PSI in the doubles. We saw a few Rockfish, a spotted drum, and various other more common species, and these mysterious rust coloured fish with big glassy eyes. The boat crew had some opinions on what the fish was, but we didn’t come up with anything definitive.

Any dive is a good dive but this good dive would have been a better dive if it were a dive on the Duane or the Spiegel Grove.

Update

The mysterious red fish is identified as a Glasseye Snapper.

priacanthus_cruentatus

Day of the Eagle May 7, 2016

Posted by Chris Sullivan in Dive Log, Shipwrecks, Technical Diving.
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For dive #3, Rob was down with a cold and Joe was still waiting for his O2 sensors to arrive. Jody had arranged to do his final dive of the rebreather course with the Gary, owner of Conch Republic, so I arranged to dive with them. This time we were on the Eagle. It was a fine day (like all of them) and current was minimal when we tied off on the stern line. When we’d descended to the wreck I put my 3/4 full deco tank (50% 02 in a 45 cubic foot steel tank) on the wreck right next to line. I recalled when diving the same wreck a few years before with Matt we’d initially staged on the bottom and as we swam away I realized that 115′ wasn’t the best depth for them, so we’d gone back and put them near the line and 30′ or so higher – saving us from descending again near the end of the dive.

Mindful of their near optimal O2 mix and effective gas capacity, I stayed about 10′ above them for most of the dive. I followed behind most of the time with Gary leading the way. We went inside the superstructure on the stern section for a bit but it was difficult for Jody to maneuver easily in the sideways wreck with his new kit. We also toured bow section, separated from the stern by Hurricane Georges in 1998, going round the bow from deck to hull then through a hole about half way day back to the deck. At one point I helped Jody get through a swim through which was giving him trouble because of the position of the bail-out tank. I just lifted it and he went right through. Then, of course, I had to make a point of sailing through without any contact, just to show myself that I could in my doubles, as no-one else was watching.

By the time we got back to the stern line I had 18 minutes TTS (time to surface) so I waved goodbye and went up to my first deco stop. By the time Gary and Jody came up I was nearly finished my deco and when I was done, I went back on the air in my doubles and hung out with them near the line while they finished theirs. I only had 100 PSI of 50% Nitrox deco gas left at that point, which was about 4 minutes worth, but at least an hour of air as a contingency in case I had run short.

While I love the Spiegel Grove for its sheer scale and upright position, the Eagle is a cool dive, especially once you get to know your way around it.

Decompression Period May 3, 2016

Posted by Chris Sullivan in Dive Log, Equipment, Shipwrecks, Technical Diving.
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Dive #2 was supposed to be on the Duane. It’s not my favourite wreck down there, and I’ve often said I could dive the Spiegel Grove every day of the week, but I’d never turn down a dive on the Duane. This time, though, when the Conch Republic boat got there, the buoys marking the site were under water, meaning very strong currents were present. I’ve dived the Duane in conditions like that and we had been surprised no-one had been swept off the wreck, so discretion prevailed and we headed off to Dive the Spiegel Grove again, which, of course, I didn’t mind one bit.

There was a fairly strong current on the Spiegel Grove as well. I was feeling slightly queasy after the long ride, but when I got to the back of the boat I was asked to wait as Rob was still getting ready. I sat down and didn’t feel to good so I told the crew I’d wait in the water and went in. It took some hauling to pull myself through the current to the descent line so I used the waiting time catching my breath using the atmosphere instead of my tank. Even so I used 400psi (about 28 cubic feet) just getting down to the bottom of the line, although some of that might have been lost due to the change in temperature. Using water temp of 27 and air temp of 33 the change in pressure due to temperature would be equivalent to about 6 cubic feet.

I was with my trusty buddy Rob. He was on his new rebreather so we didn’t push too hard – doing the swim throughs on the first and second levels above the main deck – and after reading some of the APD Inspiration manual I’m sure he had plenty enough to think about. Even though we were to dive the Spiegel Grove no less than 3 times during the week, we never penetrated the wreck below the main deck, where we need to run lines, choosing to stay conservative. In previous years we’ve gone one level below the deck and I was hoping to go further this year but it was not to be.

Rob’s kit wasn’t as streamlined as his doubles because his bail-out tank was not as parallel to his body as we tend to have with our doubles, and at one point he had to extricate himself from apparently entangling some of the many hoses on his kit while going through one of the doorways on the wreck.

As usual I racked up a bunch of deco time. Rob had very little, so this dive goes to the rebreather for minimizing hang time, although marks were deducted for the hangup in the doorway. Mind you, we were entertained by a group of Barracudas which circled us on each stop and the water was warm, although it would be been more fun to spend that time on the wreck.

Conch Republic handled everything wonderfully. Their setup on the dock is easy to use with the nearby fill station (although Mark carried my doubles to the fill station that day), hoses, hangers and dunk tanks.

Trouble in Paradise May 2, 2016

Posted by Chris Sullivan in Dive Log, Equipment.
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The morning dive was a good one. The Spiegel Grove was in fine form, although visibility was less than I’ve seen it previously. I was diving with Joe, who was on a rebreather. Rob had a low battery on his unit and wisely decided to give the day a miss, although I missed having him on the dive. We did a loop around the superstructure and then went into the 95′ deck where there is a mess hall and a workshop with a large lathe and other tools. Unfortunately Joe had a bad cell (giving me ammunition for ongoing but lighthearted arguments on the merits of rebreathers vs. open-circuit technical diving) and we ended the dive earlier than planned with only 4 minutes of deco needed on my part. Joe sat out the second dive so I went in with the recreational divers for my second dive without carrying any deco gas and finished the dive taking Jody for a tour of the same deck as the first dive. Because of a slightly shortened surface interval and a second deep dive I ended up with about 10 minutes of deco, with no 50 mix available to speed it up.

I went up the line at 30 fpm, the maximum recommended amount and started doing my stops. The 30′ stop cleared almost as soon as I got there, and the 20 minute stop was fairly short and I was at 10′ before Jody caught up. I’d seen him hanging below me and found out later he was wondering where I was, but eventually realized that I was above him. Because we were now the last divers in the water, I hurried things up by finishing my deco while swimming to the back of the boat. I’ve often done this just for fun but this time it saved 2 or 3 minutes for both the other divers and crew.

On the downside, I went into the Ocean Divers shop to buy an air fill for my doubles. The woman behind the counter made eye contact and I asked for a fill, at which point she seemed peeved and told me she had to finish some form or other for someone else. I told her I didn’t mind waiting and in a few minutes I was charged $8.60 and given a ticket to take downstairs. I talked to the guy in the air fill station who was helpful enough and gave him my ticket. No claim ticket was given to me, which I thought strange as they had no way of telling it was my tank. He asked me if it would be OK if I picked them up in the morning as he was busy with fills for the charter operation. That was fair enough and I agreed. They opened at 7 so I had time to swing by and grab the tanks on the way to a different operator for the next day’s dive. One difference between Ocean Divers and all the other dive operators in Key Largo is that the others will fill your tanks for free, but there, if you want to bring your own, you pay for the fill.

The next morning we were there at about 7:40 to pick up the tank. The guy I talked to the day before wasn’t there, and the fill station was being staffed by the same person who sold me the fill the day before. She told me that they didn’t get around to filling the tank. When I pointed out that I’d been promised it would be filled by morning, she told me that their policy was 24 hour turnaround. So bizarrely, I had to point out that irrespective of the policy, which had never been revealed to me, a promise is a promise, and the tank should have been filled. She offered to fill the tank right then, so despite this making us late for the boat I had no choice but to let her do it.

She first hooked a Nitrox hose to it, although I’d asked and paid for air. When she was called on this she said that the tank was labelled Nitrox and must be filled with Nitrox, not air. I probably should have taken my tank right there and then but I needed the fill. In rare circumstances her statement is true, when the air station is not O2 clean, but her statement reflected a misunderstanding of the nature of the problem, and certainly shouldn’t be the case at a Nitrox facility. Next she puts two yoke inserts in my DIN valves and hooks two fill hoses to the doubles. At that point I went upstairs for a moment to see if they were a PADI facility (which they are), because we were wondering as instructors whether we were responsible for reporting such faults. We concluded we weren’t. Then while we were talking about it we heard the familiar sound of purging, although these were both repeated and extended blasts of air, not a short single purge as you’d expect.

Mine was the only tank being filled so clearly something else was wrong. Looking in, I noticed she tried to tighten the valve on the left tank in the open position, just as we’d guessed. I pointed this out to her, and while closing it, she told us “the yoke is still not going to come off”. I told her she’d have to purge it first and she snapped “I know what I’m doing”. So I said that we were both certified gas blenders and we were just trying to help – a statement met by silence. Sure enough, with the valve closed and the whip purged, the yoke came right off. I wished her a nice day as we sped out of there, unlikely to return in the foreseeable future.

Mine was not the only case of rudeness, incompetence and egotism (a dangerous combination in diving) at this operation. The other disappointments will be written up by others and I will provide links to them in this blog. I’ve been to other operations on Key Largo that weren’t familiar with technical diving. None of those tried to fake knowledge they didn’t possess. Some might be characterized them as primarily suited for recreational divers so I don’t fault them for not knowing much about technical diving, as long as they don’t pretend to. Faking competence will ultimately lead to something unfortunate, so we won’t be coming back. Some of the other operators told us there has been a lot of staff of staff turnover there, not all of it voluntary.

Fortunately, it was my one and only dive scheduled with them that week.

Back in the Pool February 9, 2013

Posted by Chris Sullivan in Dive Log, Training.
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It’s been a while, maybe almost a year, since I did any pool training. I could have done some of the small things a bit better, but overall it went great and we were pleased. The students were all great and none had any undue anxiety.

Maybe there’s more instructing in the cards for me this year. For once I feel like doing it again. Or maybe it was just the energizing effect of the Nitrox I was breathing (although those effects are not proven, of course).

We had 10 students, two instructors, 3 divemasters, and 3 divemasters in training. Made it easy, even though the DMiTs were doing some of their own exercises.

Florida Keys 2011 – Vandenberg September 11, 2012

Posted by Chris Sullivan in Dive Log, Technical Diving.
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This is a continuation of the trip I took in April 2011 to dive in the Florida Keys, and I’d written most of this then but decided to finish it now. Like many bloggers the urge comes and goes. I’ve left this alone for quite a while. I left off with a dive on the Spiegel Grove, but Matt and I chartered that separately, which was great because we ended up diving the wreck 3 times during the trip.

The first official dive of the trip was on the Vandenberg off Key West. We used a different dive shop, Sub Tropic this time and they were more conveniently located for parking than the previous year’s operator and a very short distance to the dive boat. The dive boat itself was reasonably well suited for those of us diving doubles.

It was a fairly rough ride out to the wreck and several divers were sick, although fortunately I wasn’t one of them. When we got there, Matt and I agreed that we would run a similar profile using our computer maxing out at either 1 hour bottom time or 30 minutes deco time, using EAN50 as our deco gas and air as our back gas. This turned out to be our standard profile for the remainder of the week, sometimes modified slightly to accommodate the various depths.

The wreck is a lot of fun where you get to swim around the big satellite dishes (and even through the hole in the focal point of one of them) as well (assuming you’re trained and equipped) lots of easy penetrations through the hallways.

The staff were among the most helpful I’ve ever seen and well-deserved the tips we gave them. The dive shop has now closed, though, but a different one has taken it over.

One thing I’ll never forget is on the ride back from the wreck we passed a Naval vessel moored near the residences for married sailors. One guy on the boat who lived there was a chief nurse who had done some rotations through Kandahar, Afghanistan, describing it as “the worst place on earth”. It made an impression.

Why I love Cozumel September 10, 2012

Posted by Chris Sullivan in Dive Log.
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I find Cozumel hard to beat, even after the big hurricane of 2005 ripped up the reef.

  1. Protected Marine Park -> lots o’ fish, including the fabulous spotted Eagle Ray.
  2. Currents from mild to ripping -> easy ride along the reef
  3. Reef close to the island -> more diving, less waiting
  4. Lots of dive operators -> good prices & great service. The only one I’ve used there is Blue XT Sea diving.

My experience on land has been pretty limited since I rarely left the resort, except to go diving. I’m not into late nights in bars or buying trinkets. There was very little hassling of the tourists that I saw, but I might have been insulated from it.

The worst thing I’ve seen there is the taxi hustle at the airport. If you are on a package with transportation included, you have to run a gauntlet of taxi drivers inside the small terminal to go outside and find your ride. They won’t let the tour operators inside the terminal, so the taxi drivers prey on the ignorance of arriving tourists by intercepting them before they find their hotel shuttle.

You can also drink the water there, at least on the resort. I doubt I’ll be back for a couple of years. We went there several times in a row and decided we needed a change.