Quote:
Originally Posted by jhelix70
The Americans had an instrument that did this by measuring the water temp outside the hull.
http://en.wikipedia.org/wiki/Bathythermograph
It was included in SH1, but I forget if it was in SH4 or not. No word in the article if German subs had a similar instrument, but I doubt it.
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It is in SH4. It is listed in the equipement for all subs, can be damaged, and is used to detect thermal layers.