CAMPOS 1922 (US)

In 1922, Victor Campos of New York, patented an atmospheric diving suit with oil-filled rotary joints which were not pressure-compensated. The suit was reportedly taken to a depth of 600f/184m. Though clearly the suit could have reached 600 feet, it would have the dexterity of a brick. However, such devices were sometimes used quite successfully as observation chambers. The Campos joint is a fail-safe design.