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Originally Posted by Snestorm
1: How?
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Most American subs after 1943 were equipped with a bathythermograph. A device which could detect a thermocline.
http://www.fleetsubmarine.com/bathythermograph.html
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2: Why? (Japan didn't have ASDIC).
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As far as I know Japan did have sonar. Not as good as the Allied or German sets but they did possess it.