Previously recorded fate
(Last revised by Axel Niestlé during December 1997. More on revised fates.

Sunk 30 Sept, 1944 in the Arctic Ocean northwest of Hammerfest, Norway, in position 72.32N, 12.55E, by depth charges from aircraft of the British escort carrier HMS Campania.

This attack was in fact against U-636 and U-968 inflicting no damage.

24 May 1944
Aircraft attack, aircraft shot down: Canadian Sunderland aircraft DV990 (422 Sqdn RCAF/R, pilot F/O G.E. Holley)

At 14.20 hours, the boat was attacked by the Sunderland off Norway while searching for U-476 which had been badly damaged by an aircraft earlier that day. The aircraft was hit by AA fire during the attack run and and crashed into the sea after dropping three depth charges that caused no damage. All 12 crewmen were lost.

24 May 1944
At 14.20 hours, the boat had shot down a Sunderland aircraft but was shortly thereafter spotted by the Sunderland DW111 (423 Sqdn RCAF/S, pilot F/L R.H. Nesbitt) which had heard a SOS message and apparently observed the crash of the other plane from a distance of about 12 miles. U-921 avoided the five depth charges dropped but strafing wounded three crewmen, including the commander, Oblt. Wolfgang Leu. As the boat crash dived Leu got both his wounded men down the hatch but did not manage to get down into the tower himself. He slammed the hatch down as the boat dove and was drowned. On 26 May, the boat reached Trondheim, Norway under the command of the IWO. (An American submarine commander received the Medal of Honor for the very same act in the Pacific). (Sources: Franks/Zimmerman)

2 recorded attacks on this boat.