Too be honest though in my research there is no evidence to suggest that the Germans utilised thermal layers to escape very often. They knew about them but did not really have any tools that made it easy for them to determine where they were. Additionally, particularly in early war, the thermal layers in the Atlantic were by and large below the depth that u-boats could dive to anyway. The Pacific is a different matter and the Americans developed and used technology that assisted in their use. In later years and in the years after the war subs that could dive beneath the atlantic thernals were developed, but the German's still didn't develop any tools during WWII that helped them out.
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