The heavy cruiser which carried the first atom bomb to Tinian has been found. Sunk by torpedo in the Philippine Sea on her way home, out of 1200 crew, only 316 survived after days of exposure and shark attacks.
https://news.usni.org/2017/08/19/uss-indianapolis-wreckage-found
https://news.usni.org/2017/08/19/uss-indianapolis-wreckage-found