Lifeboat (1944) is an American war film directed by Alfred Hitchcock from a story written by John Steinbeck. The movie was filmed entirely in a single lifeboat,

After their ship is sunk in the Atlantic by a German U-Boat, eight people are stranded in a wooden lifeboat, among them a glamorous journalist (Tallulah Bankhead), a tough seaman (John Hodiak), a nurse (Mary Anderson) and an injured sailor (William Bendix). Their problems are further compounded when they pick up a ninth passenger – the Nazi captain from the U-boat that torpedoed them. They have to go along trying to survive being stranded, and trying to make it Bermuda before they all die.

Definitely worth a watch… nice late night show!