Gallico’s original story The Poseidon Adventure ended with the sinking of one-time queen of the sea. Irwin Allen’s original film ended with the ship still afloat.  Gallico was approached to write this sequel to the film and not a sequel to his original novel. Some of the ‘survivors’ make a reappearance; which also involves salvage men, a Communist killer and a beautiful lady pirate, a Vietnam veteran and a New York cop as the wrecked Poseidon becomes a battleground for a cargo of contraband…looted gold.