I always think its a good thing to really mess it up fairly soon after the course .Otherwise you pass the course ,go diving & everything goes well & you think well this is easy & get complacent then the damned thing turn round & bite back when you least expect it & you "think " you're a good rb diver .From what I've been told its normally around the 50 - 60 dives logged mark ,certainly it was at 63 dives on OC that I got a wake up call !

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Colin
I trust my rebreather completely ,
I just don't trust the user
onwards & downwards