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Trimix was not mentioned so narcosis would have been a big factor once the stress set in. staying deep to sort out an SMB is madness and somthing I am sure neither diver would have done given time and a clear head to think about it.
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The report says they sank back down after experiencing difficulty with a DSMB. It sounds like the DSMB was not fully inflated and buoyancy control was questionable - take a note, being negative under a DSMB is pretty dubious, despite many divers believing it is acceptable.
Now personally I can't think of a better way to induce Narcossis on myself than jumping into 30m+ of water after a 5 month break. I have to ask the question whether Trimix should be used to combat narcs when a diver is not dived up? I don't think so, it probably just means being fully aware that you are fecked.
Don't assume your skills can survive a five month lay off, that is the lesson I see here. A very apt one this time of year. I spent the Winter helping out with training in Portland harbour and the quarries but yesterdays first 'real' dive of the year was still just a bimble on the Mulburry - complete with Dolphin experience during the boat trip :-)
Even at this late stage my thoughts are with the family.