The USS Indianapolis has never been found and probably never will be. An expedition set out to find it in 2005. They found lumps of coal and a few deckhouses. Nothing else. It sank in some of the deepest places on Earth (Mariana Trench is 45,000 feet deep...), so as I said, it will probably never be found assuming it even survived the plunge (munitions and all inside might have gone off whilst being smashed around; water pressure alone on them may have set them off).
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