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cancun mark:the only time I have ever run out of air is when I have allowed myself to run out of air.
with students I would use them (octo)
solo to 30 m cesa
tech or cave, it will never happen without catastrophic gear failure, then I would only be with someone that I would trust my everything with.
That includes not only my life, but my daughters life/future. If I wouldnt trust them to be a true godparent for my four year old daughter, I wont dive with them. That is the responsability they have when they dive with me and the responsability I have for my buddy when I dive with them in an overhead environment.