Harry Houdini obtained a patent on an improved diving suit in 1921. The object of Houdini's diving suit was to allow a diver to get out of the suit while underwater in case the air supply failed. It also allowed a diver to don his suit without assistance. It accomplished this by being formed in two halves, with a locking joint in the middle. The diver could reach this joint and release it, and then escape from the suit.