Elsewhere at the training facility, the men responsible for setting the timers on and firing depth charges were drilled till they could fire full patterns of explosives at fifteen-second intervals, building efficiency that would, at sea, often mean the difference between a hit and a miss on a U-boat. Teams responsible for operating the ASDIC sonar systems hunted imaginary U-boats on the synthetic attack teacher while, in a hut at Gladstone Dock, next to Poole’s torpedo-evasion trainer, communications staff were taught how to use a new cypher machine. According to Kretschmer’s captor Donald
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