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> > This is only valid if you switch regs every 5 minutes so that your > > independent tanks have equal amounts of air in them. If you breathe > > one down first, switch to the other and then have a second or first > > stage fail, you are left with a near empty tank and a rapidly emptying > > tank. > > Doug > > Recently a diver was injured here after being in a similar situation > at 180 feet... BUT... I thought part of gas-management while diving > with independants was to use one tank halfway and *then* switch... > Not being a "techdiver" myself, I'm just wondering, because it feels > kind of logical... Assuming you're following the thirds rule you can't wait til 1/2 to switch. What happens if you switch and find out the reg is dead right away? For cave diving I switch at 1/3 on the first tank which is half way through the dive. Then I don't need to switch again (at least I hope I don't 8-). Switching at 1/3 is only about a kilo of weight change and doesn't effect roll much. Every five minutes is not necessary. Devon
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