In this sequel to the first movie "The Poseidon Adventure", the storyline continues as we witness the treasure hunt aboard the overturned vessel between salvage tug operators Mike Turner, Wilbur Hubbard, and Celeste Whitman, who are searching for cool, wet cash, and Filthy McNasty. Besides, there is a bad guy named Stefan Svevo, who is looking for a stash of hidden plutonium.