IIRC, the Thermal Layers are changed by a randomised percentage. I suspect the Readme inside SH3Cmdr will probably tell you. JS is usually fairly thorough with these things. Failing that, you can open the respective cfg file within SH3Cmdr's program folder.
Personally, although I like the inclusion of the Thermal Layers, I don't like the fact that if you know that the Layer is set to 150m, that you are safe if you hit that depth but this is a limitation of SH3. Of course, as long as you load SH3 via Cmdr each time, you'll not know what depth it is set to.
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