Thanks again for the link sergei.
Quote:
Originally Posted by Nissum
I was watching an interview with Otto Kretschmer one of the last surviving german uboat aces. When he was asked a question on thermal layer he shook his head and said that there was no such thing in these days of the Kriegsmarine. There was nothing in the uboats that could detect a thermal layer if there ever was one. The only thing he knew about it was what he had heard in later years after the war but during the war there was no such thing as a thermal layer that could protect the uboat from enemy destroyers asdic. When the enemy found you, there was only one thing to do, go deep and change direction often and hope that the destroyer lost contact with you.
Not my words but the words of one of the top uboat commanders of the WWII. 
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There's another thread about this somewhere. I'm not trying to discuss the realism of it. As it is now, the AI is almost crippled already.
Oh, and there are a section in a tactical handbook for U-boat captains about temperature gradients at specific locales so it wasn't
completely unknown.