Sidemount solves the problem because it removes the need to share gas. You should have enough gas in each tank to exit safely.
don't backmounted doubles do the same thing?
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Sidemount solves the problem because it removes the need to share gas. You should have enough gas in each tank to exit safely.
Not having the longhose is quite the gamble.
I recall an incident where a diver had bad gas in their tanks on a cave dive. In fact, it was a friend of mine. A portion of the helium component was actually argon (He and Ar use the same connector). Without a longhose, the outcome might have been VERY different. The same thing could have happened with BM or SM.
Could happen also if **** goes south and elevates a divers SAC rate.
Its not just about some catastrophic equipment failure. Its about options. Eliminating the long hose eliminates a pretty important option.
You can theoretically lose all your gas in BM doubles if you don't isolate properly or quickly enough(unlikely, but possible...). SM tanks are completely independent. SM divers often dispense with the long hose if they're not diving in mixed teams.