Final two dives, giving thanks and rebreather technicalities

On Sunday we did a series of two dives in Cousins Rock, located next to Santiago Island. On the first dive we explored the bottom of a wall next to the conventional dive site and ended the dive along the sloping bottom of the rock. Maximum depth was 44 meters. In the second dive we descended to 46 meters and explored the deep end of the sloping side of the rock. Runtime was 70 minutes. We have now ended the dives planned for this week and I will be leaving the boat soon.

I’m taking a great impression from this Galapagos Rebeathers Dive Team. Claus and Peter are wonderful individuals. Peter has great attention to detail and a very particular way of analyzing everything to make it better. Claus is a very relaxed and easy going underwater photographer that makes the best out of any situation, whatever the conditions. I hope we can dive together again sometime soon, maybe in the deep wrecks of Grenada’s waters or next year here in the Galapagos.

I would like to thank Juan Carlos Martinez, Wilson Murillo and all the staff on board the Deep Blue for the opportunity they created to test rebreather expeditions. I will be more than happy to recommend the Deep Blue and to support divers coming for rebreather trips on board their liveaboard. Also, many thanks to Claus Meyer and Peter Seupel for allowing me to use this great photo material to illustrate this report and to market Galapagos Rebreathers.

Decompression, Physiology and other Technicalities:

We used APD rebreathers (one Evolution, one Evolution + and one Inspiration) all with vision electronics. We all had OCB; Peter and I had one 5.7l/ 40cft with air each; our on board cylinders were 2l / 15cft steels; Claus used 3l / 19cft on board steel cylinders. Peter and Claus had travel frames, I had the yellow box. 

We used high 1.3 and a low 0.7 setpoints. In three occasions the last dive of the day had to be done shallow and with a lower ppo2 (between 1 and 0.5) due to OTU’s and CNS% loading. We planned mainly recreational profiles with actual runtimes no greater than 70 minutes a maximum depth of 50 meters and a total time to surface no greater than 15 minutes. 

Even though we limited our TTS and stayed within one hour run time, all the dives we did were rebreather profiles and could not have been done in open circuit; the decompression obligation and gas volumes of doing this would have made this something completely different. 

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