Description:03 38 13 00 Hawaiian Islands. Pearl Harbor. In military base, invention, prototype of a new technique of help. Close-up on a sailor in dress of rescuer. Close-up panel of the training centre. Demonstration, sailors in swimsuit with new life jacket. They lock themselves into sort of bell then opens the door and go out under the water. They pull a rope at their waistcoat which makes inflate the waistcoat and makes them go back up. Pneumatic. They arrive at the surface. Submarine dives back into the sea. Session of training. Sailors return to submarine. They swim then float in the surface.