During the day stay submerged, if you are in range of RAF, and weather is clear, sound checks every hour or so, you will be surprised how many ships passes just beyond horizon, if you know hydrophone plotting then surface only if you need some sprint to get better position for attack, later in '43 stay submerged all the time especially during the night, because they can see you in the dark, reverse tactics with short surfacing during the day, 2 hours submerged - 30 minutes surfaced with minimum TC, until you get snorkel with radar warning...
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Come closer... and die.
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