There does seem to be thermal layers at work
Or else it's the DD/DE ASW detection cones. I am in the Med in 1942 in a VIIC and if I dive down to 140-160 meters and go silent running @2knots I can evade even 2-3 destroyers at a time fairly often.
I thought Thermal Layers were modeled somewhat since the GWX manual exhorts captains to dive deep to minimize sonar signature?
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