Doug Miller / KHOU
On the floor of the Gulf of Mexico sits a Nazi ship of ghosts, a sunken U-boat whose 52 crewmen died under almost a mile of water just south of the mouth of the Mississippi River.
Robot cameras dispatched by the Nautilus last week showed the distinctive outline of U-166's conning tower and deck gun, a sight instantly recognizable even to amateur historians and World War II movie buffs. The once sinister ship now sits peacefully on the ocean floor, covered with colorful marine life.
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Click here if you'd like to see more of the spectacular video shot by the Nautilus. The ship's crew also streams live feeds of its underwater explorations on this site.