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Originally Posted by Jmack
well .... i believe that the working method was not to detect the DC's falling in the water , but it was to locate the explosions by the shockwaves since the device was atached directly to the pressure hull and to make the u-boat go to that area since it has been ALLREADY sweeped by the enemy it would give at least a couple more minutes to decide what to do .
THIS ASSUMING THAT THE FIRST ATTACK MISSED THE TARGET
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I understood what you meant. In the First World War a British destroyer captain being shot at by a larger ship started "chasing splashes", as he called it. If a salvo landed two hundred yards long he would head that way, assuming that the firing ship would correct down ladder, and when the next salvo hit where he had been he would now be where the first salvo landed, making the new salvo fall short.
Unfortunately, destroyers don't drop depth charges that way. There is no "we bombed point X, now let's go try point Y", so there is no point in the sub heading for point X. The destroyer drops a pattern where his sonar tells him the sub should be. Once the depth charges explode the water is highly disturbed and he loses contact. He slows down and circles, searching the area hoping to regain contact. If he does, he then once more heads for the sub and tries again.
If he was off by several hundred yards, the sub captain is going to hear faint explosions in the distance. Knowing that the attacking destroyer is way off base, he's not going to go where the attack is; he's going to try to sneak away in the opposite direction.