Going by accounts of WW2 patrols of german and italians subs active sonar was audible by the crew as follow:
1) Ticking, as of a clock. Most common description I have encountered in my admittedly limited sample.
2) As if gravel was thrown on the hull.
3) Banging hammer (I have this replacing the stock ping in my game install).
Circular saw noises were frequently reported as well, but nobody was really sure if that was ASDIC or anti homing torpedo decoys.
Ping style sound is never described by those on the receiving end.
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