As a general rule, subs weren't sent after subs anyways. To make a submerged kill would require the best sonar of the day coupled with a spot-on targeting solution, the torpedo being set to the exact right depth within a half-dozen feet in either direction. That's a narrow, highly precise shot, fired blind on instrumentation alone.
Could be done...but a sub duel under those conditions would be a lot like watching a pair of blindfolded Old West gunfighters.
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"I felt a great disturbance in the Force, as if millions of fanboys suddenly cried out in joy and won't shut the frak up." --- PsyOps
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