Hmm, my guess then is that you didnt give the torpedoes enough room to deal severe enough damage to the ship (although one would think that four is enough to blow half the hull off). Depending on where they all it, it might have just been four concentrated explosions, as opposed to a group of four spread out under the keel or hull.
Also, depending on what your angle was when you fired (if you used magnetic torpedoes, but I'm going to guess that you used inpact), your shots might have gone under the keel, and then exploded, which doesnt yeild as much damage.
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