rtokens: The wreck was located in 1985 .
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tokens: The steel-hulled Titanic , thought to be unsinkable , struck an iceberg on April 14 , 1912 , and sank , killing 1,523 of the 2,200 passengers and crew on board .
ltokens: It fell as recovery crews were trying to haul the piece into more shallow water and several of the bags burst and cables snapped , she said .