Depthsounding only happens on your order, no need to worry about it. Just don't do it with warships about.
Thermal layer varies in depth, depending on temperature, salinity and what not. You'll know you're below it when you hear a voice saying "passing thermal layer". Sadly there is no BT modeled in the game apart from that voice (if you can call that BT modeling).
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Contritium praecedit superbia.
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