Human torpedoes or manned torpedoes are a type of rideable submarine used as secret naval weapons in World War II. The basic design is still in use today; they are a type of diver propulsion vehicle. The name was commonly used to refer to the weapons that Italy, and later Britain, deployed in the Mediterranean and used to attack ships in enemy harbours. A group of a dozen countries used the human torpedo, from Italy and the United Kingdom to Argentina and Egypt, and there are some museums and movies dedicated to this naval weapon. The human torpedo concept is used recreationally for sport diving.