A slang word used to describe the opening in amphibious boats hull. It was named the murder hole in World War II by the marines who would land on Omaha Beach and experience German gunfire from the trenches killing most everyone inside the boat instintly. It was very terrible to be one of the first men in the boat. It was used and showed in the movie Saving Private Ryan.
"Clear the Murder Hole!"
"Move fast and quick, watch for those mines, and clear those murder holes!"