Skydivers were fictional futuristic submarines featured in Gerry Anderson's TV series UFO, operated by the secretive SHADO organisation as part of Earth's defences against alien aggressors. Like many Anderson vehicles, Skydiver One (almost identical to Skydiver Three, the only other to be seen, in the episode "The Psychobombs") was designed by Derek Meddings. It could be distinguished from a conventional submarine by its prominent conning tower and by the supersonic twin-engined interceptor fighter that replaced the bow section.