I know it sounds silly but I'm following up the accident in 2002 on Eric Reichardt, where GSAF concluded he was attacked in-water while on his rebreather.
http://www.scubaboard.com/showthread.php?t=8278
Because the article is no longer available from the original link there is this from the newsgroups:
http://groups.google.com/group/rec.s...424e0007983c00