German submarine U-853 was a German Type IXC/40 U-boat of the Kriegsmarine during World War II. Her keel was laid down on 21 August 1942 by AG Weser of Bremen. She was commissioned on 25 June 1943 with Kapitänleutnant Helmut Sommer in command. U-853 saw action during the Battle of the Atlantic in World War II. She conducted three patrols, sinking two ships totalling 5,783 tons. U-853 is a popular deep sea diving site. She rests in of water. Holes in the hull permit access to the interior of the submarine, though it is a war grave with most of the 55 crew bodies remaining inside.