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Hi Jon and Ray. Yes, 55 gallons of displacement will weigh about 8 pounds
per gallon, but items weigh a lot less when submerged, so 55 gallons of air will
raise more than the "dry weight" of an object when submerged. Now a 55 gallon
drum ( not counting the drum itself ) could raise 400 plus, clear of the water,
but just getting it off the bottom is what I was referencing. We're talking
about getting a psub to come back to the surface, not get it up on the trailer.
Frank D.
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