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A funny thing happened while leisure diving in the Carribean.  We had just
a little deco to do from a short deep dive.  At 1000 psi the o ring on the
tank k-valve sprang major leak.  I shut valve and finished deco on buddy's
air.  

When we got on the boat the divemaster said, "Oh yea, that happens every
now and then.  The o-ring seats in the k valves are a little too deep and I
sometimes have to pop the air on suddenly to get the o-ring to seal. But
often when I do that, they will leak when tank pressure goes down to 1000."  

Notes:
(1) I never did like "luxury" dive operations where the divemasters change
your gear over.

(2) I had never really thought about an o-ring failing because the pressure
was too low, but in retrospect, it makes perfect sense. The concept of
increased risk of failure as pressure goes down is interesting to me. 

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