The reason I asked this question is that I'm reading 'Klebers Convoy' at the moment and Kleber continuously dives deep to get under the thermal layers that, according to the book, are prevalent in the colder waters of the Arctic. By the time the escorts get to him after picking him up on radar, they can't ping him. This is whilst he is shadowing a convoy in poor weather and in the dark. I am aware that this book is fiction but I would have thought the author has done his research. There is one problem though, I think that East of Bear Island and near the Skolpen Banks, the water isn't very deep although if its near 200 meters then that would be deep enough.
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