"Günther Prien was killed when U-47 was lost with all hands (45 men) on 7 or 8 March, 1941.
"U-47 left Lorient (France) for her tenth patrol on 20 February, 1941. Just four days later they attacked convoy OB-290 and sank four ships for a total of 16,310 tons. The last radio message from U-47 was received in the morning of 7 March."
"This incident is now being questioned, as the traditional credit for U-47's sinking has always been attributed to the British destroyer HMS Wolverine, but new data suggests that the destroyer was actually attacking Eckermann's UA which had to withdraw from the battle with heavy damage.
"It is now speculated that U-47 was hit by one of her own circling torpedoes. (Two US submarines in the Pacific are also believed to have been lost to the same sort of equipment failure.)"
Joachim Schepke was killed...
"Joachim Schepke was killed when U-100 was sunk at 0318hrs on 17 March, 1941 southeast of Iceland in approximate position 61N, 12W after being rammed and depth charged by the British destroyers HMS Walker and HMS Vanoc. Vanoc spotted U-100 with her early radar in heavy fog and chased the contact. 38 men were killed, including Schepke, who is said to have been caught on the bridge when the boat was rammed. Six crew members survived."
"On his last patrol he was also very successful and attacked 10 ships. He was captured after scuttling U-99 at 0343hrs on 17 March, 1941 (Schepke was lost in the same battle) south-east of Iceland in approximate position 61N, 12W after depth charge damage inflicted by the British destroyer HMS Walker.
"Kretschmer managed to surface his badly damaged boat and save 40 out of his 43-man crew (his chief engineer died) before the boat sank again for the last time."