Whats giving you away is the 14Knt racket coming through the hydrophone - you may as well put a big neon sign above you boat saying "Sub here! Sink at leisure."
At that amount of noise they dont even Need the ASDIC!!
I do agree tho that at speed the ASDIC should be off, and you know what, it is. The speed tho is at 15Knts, which is the correct speed that the ASDIC housing is retracted back into the hull. At speed's above 15Knts there was a very good chance that the ASDIC housing would sustain damage, even to the point of being ripped off the hull.
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