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" ... In building Proteus, Fabien is continuing in the family tradition. His grandfather helped develop one of the first such habitats, known as Conshelf, in 1962, a two-person habitat located about 33 feet below the surface off the coast of Marseilles, France. That project was followed by Conshelf II, a habitat where aquanauts lived for a month at a depth of 36 feet and then at 82 feet for two weeks in the Red Sea. A spate of similar projects followed around the world over the next two decades, but less than a handful exist today, most dating back to the 1970s or 1980s. ... "