Yes. It is related to H.sie patch. If you read the manuel, it is explained very well. If you want to have minimum risk of failure, you should launch your torpedoes at least 4*windspeed/10 m depth.
Example :
Wind speed is 6m/s, safe depth to fire the torpedoes is 4*6/10 = 2,4 meters
Wind speed is 15 m/s, safe depth to fire the torpedoes is 4*15/10 = 6 meters
Any torpedoes fired with depth set to less than windspeed/10 will %100 fail.
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"Though I'm past 240 meters, I'm feeling very still and I think my u-boot knows which way to go ..."
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