Agreed but you still need to practise it just in case no matter how unlikely, hey i even had a cave collapse on me and i used the force to escape cetain death, and a cave collape is almost as unlikely as being hit by lighting (or so I like to think)
"Not all change is improvement...but all improvement is change" Donald Berwick
My limited understanding is that complete gas lost in SM would be very unlikely but a hose running across one's chest does certainly catch on things in smaller passages.
Also, I route the long hose straight up from the right tank. so the hose is really no different along the chest than it would be with a short hose. On the left tank, you could do the same thing with a reg with a left side inlet fitting, or with a reg with a right side inlet fitting, you could run it straight up from the tank, then around the back of your neck.
As you said, no way a cave collapse is infrequent. Hope everyone on here realizes it's a risk they take.
Last edited by jj1987; 09-30-2010 at 02:00 AM.
Man one cave here I dive has rocks the size of houses just waiting to fall and one did and buried the line a while back, there is a cave near santo Domingo too were a Volkswagen sized boulder totally buried the line.
I know it happens that's how I messed up my knee, it will never stop me from going cave diving it's the cave diving equivalent of surfing's classic thinking about shark attacks when at dawn surfing muddy river mouth breaks like La Boca, only a bit less likely in caves (again so I like to think) as there are way fewer cave divers for collapses to eat, but then again maybe not.
On one of my trips to Peacock in the last year or so, I noted a large rock sitting squarely on the line just short of the waterhole sink. It was not there the last time I had been there. That rock is large enough to have seriously squished a diver had it fallen at the wrong time, but again I would not regard it as a "cave collapse" as it is not blocking the passage, and short of actually landing on them, would not have seriosuly ruined anyone's day.
And to get it back on topic, that rock would not have required either a handoff of a tank or a long hose for two divers sharing gas to get past. Although I think trying to exchange tanks in a semi-small tunnel in the total silt out that would have resulted when it fell would have been interesting. A lot easier to just hand off a long hose...
Billyf and Tegg on here have an interesting story about a river cave wanting to hold them captive as well.
I figure, it would be a pain--not impossible, but a pain--to swap tanks. Doing it during an emergency just seems like an extra thing likely to cause stress and delay in getting out. But everyone knows how to breathe off a spare reg. With a hose long enough for a SM restriction, just hand it off.
I decided that I needed a redundant glowstick --Mark Schroder