ARLINGTON, Va.—The lights above the water’s surface cast a ghostly glow on the bottom of the sprawling tank, as a U.S. Navy diver deftly swam through a sunken aircraft fuselage. Wearing a special ...

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If you've ever wanted to explore the ocean floor while staying completely dry, a diving bell ship might be your answer. This sealed, pressurized chamber lets you stand and walk at the bottom of oceans ...