Land Locked
Contributor
crabball:I have personally seen first stage fail underwater. The point of failure is the high pressure seat in the first stage.
This can happen to a lot of used/ rental/ unserviced reg. Which makes sense to us that dives a lot to get it serviced every year.
When the failure occur, your first stage will seems like it is free flowing and you will find that most of your air get drained pretty quickly and there is nothing you can do except to turn off the tank valve and ask your buddy for air. There may or may not be a pop sound and the rate of free flow also depends on how bad is the seat broken.
Not nice to try at all....
Regards
Andrew
This happened to me, and guess what, it was just serviced "total overhaul" I think
it's called a level 3 service. Turns out the NEW high pressure seat was defective!
ABTW there was no pop or warning sound, just freeflow.