[sublynx]

Out of curiosity I was glancing BDU's war diaries from January 1945 in U-boat archive and found a report that said:

IV. Current Operations:
a) None.
b) 1) U 427 (acting as shuttle-escort to the convoys off the S.W. coast of Norway), fired a 3 fan torpedo on a destroyer formation which was attacking the convoy, at 2338, in AM 3277.
At 0012 and 0045 she fired hook shots on hydrophone bearings. Detonations and sinking sounds occurred both times. The submarine was thought to have sunk 2 destroyers, a short report is awaited.

Later the report said:

d) 1) Escort-submarines off southern Norway: A short report from U 427 showed that of the 2 destroyers presumed to have been sunk yesterday, 1 destroyer was sunk for certain as a direct hit was observed and sinking noises heard, and another destroyer had anyway been torpedoed. The ship which was sunk might possibly have been a cruiser. A statement to this effect will be made in the OKW-report (Supreme Command of the Armed Forces).


In Wikipedia U-427 is mentioned as a U-boat that never sunk anything, but managed to survive over 600 depth charge attacks. I think the report is probably wrong in assuming that the torpedoes hit anything, but it does indicate that in 1945 shooting torpedoes on hydrophone bearings was an acceptable procedure to BDU and if I remember correctly I think I read somewhere on these forums that the Americans actually sunk one Japanese ship shooting blind, based on hydrophone bearings.


If someone is curious about the report, you can find it here:

http://www.uboatarchive.net/BDUKTB30362.htm

P.S. oh yeah, sorry about this message being a bit off topic.