Beyond the Poseidon Adventure

The S.S. Poseidon is still afloat after six survivors have been rescued via helicopter. Tugboat captain Mike Turner (Michael Caine) discovers the shipwreck. Dr. Stefan Svevo (Telly Savalas) and his crew claim to be Greek Orthodox medics who received the ship's SOS. They board the doomed vessel through the bottom hull opening left by the rescue team (from the previous movie), then become trapped after the entrance collapses.