There was a case of a haunted U-Boat U-65 in WW1
there's a belief that once a boat or ship gets a taste for blood nothing will cure it. ...
the body of Manfred Fritz Bajorat.
That's a weird story in itself: the body was found apparently a week after his death, although it was completely mummified as if it had been there much longer. Somebody must be wrong!
I vote to sink the ship to make a reef.