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The 90 second rule for surface supply air from my old supervisor
I had no idea until last month that a diver on surface supply only has about 90 seconds to get to a backup air source if the main line fails at depth, and I learned it from a laminated card taped inside a hatch at the Harvey lock dive station near New Orleans. My old supervisor used to say it plain: "Count it out, that's your whole window." I ran the numbers on our own setup at 60 feet and it made my stomach drop a little, because our backup bottle was stowed further than a quick grab. Curious how the rest of you rig your bailout stow on shallow river work, do you keep it on the harness or clipped to the helmet?
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