Closed-cell foam will not absorb water, and since his little system seemed to have worked, that's probably what he used.
My own issues were: he used so little of it, it can't have affected the buoyancy that much. And a dry bag that size full of water would only weigh about 16 pounds, hardly enough to counter a 160-lb. man climbing in on the other side.
I guess we have to appreciate these programs for their entertainment value, not for their technical/realistic accuracies.
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You have meddled with the primal forces of nature, and YOU ... WILL ... ATONE!
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