Relatives of the missing crew remembering their loved ones. Photo: Mario De Fina/NurPhoto via Getty Images
Details: Lost 270 miles off Argentina's Patagonia coast, rescuers originally held out hope for finding the crew members alive last November after possibly locating a distress signal. However, as the search wore on with no success, it become clear that the sub's crew had been lost. The wreck was ultimately discovered 2,625 feet below the ocean's surface.