miketsp
Contributor
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The comment about the same gear being susceptible to the same failure, I agree, is a rare circumstance and less likely with high quality gear.
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Not so much the quality of the gear as the complexity of the gear. At the recreational level it's most unlikely. Here in Brazil, some years back (August 2002), there was a very famous cave diving incident where the rebreathers of both members of a team failed in precisely the same manner (very long & deep dive 150m, site Ceita-Core). Both were very lucky to survive. In part the problem arose because of the angle of the cave - they spent long periods in an attitude not recommended by the rebreather manufacturer. Both divers spent a total of 19 hours in the chamber as part of their recovery.