SM U-22 was one of 329 submarines serving in the Imperial German Navy in World War I. U-22 was engaged in commerce war as part of the naval warfare, during the First Battle of the Atlantic. U-22 had a career of 14 patrols, sinking 43 ships for a total of 46,583 tons. Additionally, she damaged three ships totalling 9,044 tons, and captured 1 prize worth 1,170 tons. Captain Hashagen was the most successful, sinking 28 of the vessels, the largest being the British passenger steamer California at 5,629 tons. She was sunk 145 miles NWxN3/4N of Cape Villano on 17 Oct 1917.