A cylinder on a submarine that takes a man to the surface in case of accidents.
Titles read: "CHEATING DEATH! The newest submarine life-saver."
Various shots of a submarine at sea - exterior and interior. The submarine submerges and inside we see a special cylinder that will hold a man and can be hermetically closed. A man gets inside and is propelled to the surface, where he can lift the lid. He gets out and climbs onto a raft. The cylinder is sent back below. L/S of the submarine surfacing.