USS Indianapolis

Movie starring Nicholas Cage made i fo not know when.  Interesting, well-written.  If you do not what this ship was: it was a eavy cruiser that traveled without escort to deliver Fat Man to Tinian for delivery to Hiroshima.   On the way home, a Japanese submarine sank it, causing enormous loss of life.  Sharks.  Lots of them. 

I knew a little about it, partly because of Jaws and partly because an uncle served on a ship that sank during WW2.  Most of his fellow sailors were either eaten, or killed my Japanese sailors also from sunk ships doing their best to keep killing Americans.