The Deep Star 4000 was a self-propelled vessel designed by Jacques Cousteau (inventor of the aqua-lung) and built by Westinghouse for undersea exploration. At this stage of its conception, the Deep Star (then called "Deepstar") was expected to reach a depth of 12,000 feet and accommodate a three-man crew. The vessel had two components: a hydrodynamically shaped outer layer and a spherical cabin six feet in diameter. Deepstar would run on a 24-hour battery and cruise at 24 miles at a speed of 3 knots. Additional components included a television camera, a remote-controlled arm, a two-way radio, and a tape recorder. Deep Star 4000 went on to complete 13 dives between October and November 1967, although its crew almost died on one dive after the vessel's ascent system malfunctioned at 10,000 feet.
Read the full story in "To the Bottom of the Sea in a Saucer"