Tank to negative for safety?

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Have him take along an SMB or lift bag with reel or spool for redundant lift.

the K
 
If we're talking singles here, he may very well be able to swim them up even with a complete loss of buoyancy. Have him give it a try sometime in a pool... weight himself as if he were diving with his thickest wetsuit but don't wear the wetsuit (to simulate compression at depth), dump all the air out of the wing and see if he can swim the tank up. I'd be willing to be he can.
 

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