(Video). Sealab. (2019). PBS
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On a February day in 1969, off the shore of northern California, a U.S. Navy crane carefully lowered 300 tons of metal into the Pacific Ocean. The massive tubular structure was an audacious feat of engineering - a pressurized underwater habitat, complete with science labs and living quarters for an elite group of divers who hoped to spend days or even months at a stretch living and working on the ocean floor.