How likely is this to happen if you don't screw the pooch in multiple other ways?
The double-fatality in Calimba is the one example I can think of, and there was so much wrong with that dive, that its a good example in how to never get into this situation...
Sheck did have an experience in _CM2M_ where he nearly died in a double fatality while obeying all the rules. They were diving thirds under the 1/3 stage + 1/3 backgas rule, but at max pen his buddy had a catastrophic gas loss problem and sheck ran out of backgas about 50 feet before the stage (his buddy had a few scrapes of gas left and went back on his own supply). That is one reason why diving stages to 1/2 and reserving backgas puts you in a better situation when you turn, since everyone should have 3x the backgas penetration gas in backgas, not just 2x. Teams of three help even more.
lamont,
So much went wrong on that Calimba dive, yet two divers emerged alive. That could have been a quadruple fatality, or two double fatalities, depending upon how you look at it. Of the two who died 250 feet from the exit, one of those could have made it.
The OOA buddy cannot be saved unless he drags your lifeless body & tanks out with him.
That said, somebody's been watching too many Sea Hunt reruns. This game is stupid. Divers in this circumstance (and people have definately been in it and will again) don't check their SPG so they never realize they don't have enough gas. They are too busy focused on the task at hand (whatever delayed them) and the gas sharing to bother to check. By the time they do check (if ever) they are both gonna drown.
For those proposing to close an isolator what would you do when you drowning buddy starts clawing your eyes out and ripping your backup out of your mouth? Knife him Sea Hunt style?
rjack,
I'm really surprised that you would take this thread to be "a stupid game" since you normally are very insightful in your posts. As you just said, "... people have definitely been in it and will again ..."
Good gas management, solid planning, training, and experience will not make any diver bullet-proof. Things happen and these things may not be out of a
Sea Hunt episode.
While a collapse may be out of a
Sea Hunt episode, I know a guy who dug out of one. He was being reported lost by two divers as he emerged. A fairly common reason for a delay is when a team member cannot equalize while descending when diving a saw-tooth profile cave. While this has never created a fatality, it isn't beyond the realm of possibility that a diver under time pressure could force a descent and further delay an exit due to a rupture. This may be a
Sea Hunt disaster as well.
What isn't out of
Sea Hunt is that many divers are diving less due to the economy and these same divers have the scooters, rebreathers, and the knowledge to go farther than many cave divers in the past. With more divers in caves, divers ahead of a team or behind a team could be responsible for creating problems that may cause delays.
Regardless of why a team found themselves facing a double fatality, most of the time, one diver from that situation could live if he or she chose.
I intended the thread to explore that decision.
If you don't find value in this thread, fair enough.