Discovery of WWII Submarine "Hit 'Em Harder" USS Harder and Crew Gravesite
https://www.prnewswire.com/news-releases/discovery-of-wwii-submarine-hit-em-harder-uss-harder-and-crew-gravesite-302153454.html
HARDER was officially credited with having sunk 20.5 enemy ships, (The half credit was given for a ship sunk cooperatively with HADDO).
This gave HARDER a total of 82,500 tons sunk and she damaged seven ships for 29,000 tons.