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its dead quiet under the ice
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hell no ! all year round the ice is always moving winter to summer always shifting always breaking always filling gaps and the noise is very high under the ice.
you wouldnt think so but it is, theres a guy on HMS Tireless i know a good friend he is sonar oparator he came back from ICEEX04 or 05 cant remember and he said that it was like listning to cars crashing into walls all day long.
thats put me off being sonar oparator
there are thermo's but the closer to the ice you are the better but you also put yourself in a bad situation as your sensor's cant realy pick up enamys that well, i stay between 30 and 50 meters at 3 to 6 knots only if tracking do i excead that and only if i know i wont be detected.
4 months ago i trailed a chinease Xia SSBN under ice at 12 knots for 11 hours no problem untill she went shallow real shallow 25 meters i almost lost her at one point because the ice was making a racket that it was covering the other subs noise, the Xia is pretty loud on its own it was only because she went to 200 meters i caught her again.
colder the water the less the sound travels or is it the hotter the water oh crap i forgot
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Like bandit mentioned, ice is highly reflective to sound, but its irregular contour would produce unpredictable bounces
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yes it would it would be like shining a light or laser onto a very broken mirror the rays would go every where and thus breaking up and masking the sound another reason why i travel shallow.