I got caught in a similar situation recently. I went deep and quiet, but eventually the boat becomes too heavy to maintain depth so you have to up your RPM's to lift it, which makes noise and repeats the cycle. The escorts up top eventually ran out of fireworks but continued to circle and ping. I had more or less resigned myself to death and upped the TC. After about 6-7 hours of game time they broke off and left the area. Either they gave up or somewhere in the TC period they lost contact. I survived, surfaced and sailed straight back to base to repair the hull and all the machinery they had smashed for me. On the other hand, my crewmen got to enjoy an extended shore leave, to go home and fix their houses that had been smashed by the Allied terror fliegers while they were away at sea.
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