It isn't in all cases an air dropped torpedo. It is an aircraft. I was at periscope depth after a routine dive. When I raised the asparagus (thats what the WW1 crews called it), a Liberator was close abeam and the sound switched 180 degrees when he passed overhead. I still go as deep, as fast, as I can when aircraft are around. Haven't shot it out with one yet on purpose.
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