Probably, you are too shallow. You need to dive below 150-200m for the thermal layers to protect you. Speed 1 knot silent running, keep helm at 5 degrees to port
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"Submariners are a special brotherhood, either all come to the surface or no one does. On a submarine, the phrase all for one and one for all is not just a slogan, but reality.” -- VADM Rudolf Golosov
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