The destroyers know the deep of the sub because the asdic transceptor emits down in a determinate angle, when the sub echo dissapears means that is crossing the angle line.
i remember a destroyer command mod for the sonar active screen that makes it, with a scale yo can know what depht you have to set the depth charges or the distance.
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But this ship can't sink!...
She is made of iron, sir. I assure you, she can. and she will. It is a mathematical certainty.
Strength and honor
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