PO Owen Francis Patrick Hammerberg

http://www.honorstates.org/index.php?id=307361

Served as Boatswain's Mate Second Class, Deep Sea Diver in the Pacific Fleet Salvage Force, Pearl Harbor, Hawaii.

On February 10, 1945, during salvage operations in West Loch, Pearl Harbor 2 fellow drivers became trapped. Aware of the danger when the divers were hopelessly trapped in a cave-in of steel wreckage while tunneling under an LST sunk in 40 feet of water and 20 feet of mud, he went overboard in a valiant attempt to effect their rescue.

He reached the first of the trapped men, freed him from the wreckage and continued desperately to save the second diver. Reaching the place above the other man just as another cave-in occurred, a heavy piece of steel pinned him crosswise over his shipmate.

He stayed in a position to protect the man beneath from further injury until they were both rescued. Due to the full brunt of terrific pressure on himself, he succumbed 18 hours later.

He was posthumously awarded the Medal of Honor for his actions on that day.

https://en.wikipedia.org/wiki/Francis_P._Hammerberg