flots am
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I dive Side mount and some times, on a day where the vis is above average and i'm on EAN 40 i like to stay down as long as possible, who doesn't. the question is just how low would you guys consider safe.
How much gas do you need to get back to the surface safely, from any point in the dive, including handling any deco obligation and any possible entanglements, if you lose one of your tanks?
Once you have this number, you'll know.
Sorry for the non-answer, but it's completely irrelevant how much gas anybody else needs. What matters is what you need.
For a shallow no-deco dive, the answer might be "none." For a deeper/longer dive with potential deco or overhead, the answer might be "You need bigger tanks"