Three men? Three Herculeses? As above, the gold would have been virtually the same weight underwater as it would above, well over 2000 pounds (more like 3600 pounds as the script later stated) Three men cannot lift and carry over 1000 pounds apiece! The strongest of powerlifters can barely get that amount of weight off the ground in perfect form and with special knee and abdomen wraps, for mere seconds.
Regardless, they didn't lift anything in the scene. The conveyance carrying the gold simply drifted along on its propulsion system, in neutral buoyancy.
To do this in reality and carrying a weight of 3600 pounds, it would have needed several very large buoyancy chambers big enough to equal the volume of 3600 pounds of water, and evacuated of such water, and there were no such buoyancy chambers on it.
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