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Originally Posted by scrag
There were a few recorded instances of sub vs sub action - submerged. One case was towards the end of the war when a Brit detected, fired on and sank a submerged U-Boat. This was obviously very rare but in fact did happen. How they did it was to plot bearings over a course of time and developed a solution much like today's TMA techniques. Using a spread of six fiish solved for inaccuracies in the solution. What was hard though was guessing the depth, which the Brits did manage to do.
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Actually this particular case was also visual - as I recall, the Germans' "terrible periscope drill" was quoted. The sub was at periscope depth when it was struck, which would not have been very difficult to do. I suppose the brits had enough to go by from the periscope sightings and the sound bearings. I think the attack also took place in a fairly confined area just off Bergen, and the Brits knew the sub was coming after being aleterted by intelligence. So it was certainly more of a pre-planned ambush on an unsuspecting U-boat than a sub to sub battle as such.