On the note of torpedoes missing their targets... Make sure you open the torpedo doors before firing, as the weapon oficer doesn't take the time to open the doors into account.
(The default key to open the currently selected tube doors is 'Q')
Also, On the note of them always finding you, They will. It's a case of whether or not they hit you. If you're on silent running and going straight ahead, they'll just start guessing.. which, if you're going in a straight line, can often end up with you sinking to your watery grave.
Turn, Often and regularly.
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