O2 rebreathers where touched on so I wont hit that again. What I will add is that a CCR, especially when running trimix with low O2 content, is much more labor intensive when shallow and not maintaining a consistant depth. Deeper is better but it helps if you can maintain a depth. Also I don't think they're the best method for extreem depth (in excess of ~ 650') because you have to suck the gas through the scrubber.
So long answer short, they're safe shallow but require extra management and really have a sweet spot between ~60' and <650' IMHO.
So long answer short, they're safe shallow but require extra management and really have a sweet spot between ~60' and <650' IMHO.
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