If you had 3 duds in a row the most likely culprit is you were hitting on the curved hull of the ship with impact torpedoes.
I've had 2 duds in a row in-game, but never 3 in a row.
But if your depth is set wrong they will glance off of the curved portion of the bottom of the hull.
The most common in-game defect of magnetic torpedoes is pre-detonation, which usually happens outside of 1000m.
Steve
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