One of the dumbest things I've ever done was actually a few days ago. It had the potential for being fatal, but good training meant it was just another incident to deal with (I mean the training I received, not any training I may give others!). It involved mounting two auxillary cylinders to my rebreather the wrong way round, and then connecting one to the machine at depth. Amazing how fast the pO2 of a loop shoots past 2.6 when you flush with pure oxygen at 160'.
Lesson to learn - you and you alone are responsible for your own gear and its configuration, and it's no use blaming anyone else when the unmentionable substance hits the whirling object. Other than generally needing to be more careful in future, it did teach me that every output from a tank holding a rich mix (in this case pure oxygen) needs to be clearly marked so it can be distinguished by feel, not just the second stage as I had thought previously.
If there are readers who don't understand some of this I apologise - I'll explain if anyone REALLY wants me to. But the lesson is for everyone.
Edited by peterbj7, 05 August 2005 - 07:58 PM.