I know of a guy.... I know it's not confirmed...... That said in the Navy he had went out of a Bell with a MK15 at over 1000feet. Said it had happened a few times... Also, didn't want to get specific about depth...

Nothing in print, but he isn't a lier......... So I tend to believe him..

Doing it doesn't seem to be a problem. It's starting at the surface and coming back to the surface that seems to be the problem.

IDA72's were bell supplied SCR's with a bailout onboard in case you lost your feed. They were for Deep working diving. Forgot what the depth was but I heard around 300m.... But, nothing confirmed about that...