Continental Shelf Station Two

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Continental Shelf Station Two or Conshelf Two was an attempt at creating an environment in which men could live and work on the sea floor.

Six oceanauts lived 10 meters down in the Red Sea, off Sudan, in a starfish-shaped house for 30 days. The undersea living experiment also had two other structures, one a submarine hangar that housed a small, two man submarine referred to as the "diving saucer" for its resemblance to a science fiction flying saucer, and a smaller "deep cabin" where two oceanauts lived at a depth of 30 meters for a week. The undersea colony was supported with air, water, food, power, and all other essentials of life, from a large support team above. Men on the bottom performed a number of experiments intended to determine the practicality of working on the sea floor and were subjected to continual medical examinations.

The work was funded in part by the French petrochemical industry, who, along with Jacques Cousteau, hoped that such manned colonies could serve as base stations for the future exploitation of the sea. Such colonies did not find a productive future, however, as Cousteau, after forming one more deeper Conshelf station a few years later, repudiated his support for such exploitation of the sea and put his efforts toward conservation. It was also found in later years that industrial tasks underwater could be more efficiently performed by undersea robot devices and men operating from the surface or from smaller lowered structures, made possible by a more advanced understanding of diving physiology and more complex mixtures of breathing gases.

Conshelf Two is documented in Costeau's 1964 documentary film World Without Sun.