I've done those dives. Never lost a teammate.
Again, the chance of losing a teammate (which I've never had happen) *and* simultaneously blowing a hose (which I've never had happen) isn't worth planning for. It's like asking what are you going to do when your main cylinder blows and then your pony blows. We just don't plan for two major failures.
Again, the chance of losing a teammate (which I've never had happen) *and* simultaneously blowing a hose (which I've never had happen) isn't worth planning for. It's like asking what are you going to do when your main cylinder blows and then your pony blows. We just don't plan for two major failures.
Visibility can be a foot or less. That makes buddy separation a real possibility, even with good buddy skills, in which case you're diving solo like it or not and the redundant gas might be the only option for you when you blow a hose at 130 feet and you can't see your hand in front of your face.