When I dive my sub and I get to a certain depth, the crewmen (sonarman I think) states we've passed the thermal depth. How the heck does he know this? Is he part Echo the Dolphin or something or is there and instrument on US subs that wasn't on German U-boats that lets US submarines know this?
I thought the scientific explanation of thermal layers didn't come about until after WWII and sometime after the invention of nuclear subs. Sometime in the late 50's I thought.
Also, has anyone noticed if the thermal layer is always the same depth in this sim or does it randomize in different areas?