Thermal Layer Sea Power, thermocline is the other name used, what is it, how does it matter for under water warfare, etc. Welcome to PMC website for naval warfare game: Sea Power Naval Combat in the Missile Age.
See Thermocline Naval Warfare PMC Tactical.
You can see where the current thermal layer depth is by hovering mouse over "Keel" at the bottom left corner of the GUI as seen in example image below.
Submarines can try to hide easier from surface ships by staying under the thermal layer. PMCTODO