That's the sound of deceleration. 1/3 speed is too slow for me. I use 2/3 and only use 25% fuel on a month-long patrol. You can save fuel whenever an air threat is nearby by submerging and switching off for about an hour then surface.
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"Silence means death. Stand on your feet. Inner fear your worst enemy."- Sepultura.
My Silent Hunter 5 mantra is this......"Torpedo missed, sir!" 
A P-400 is a P-40 with a Zero after it.
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