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I would be curious to get a definitive answer as to whether or not this feature does in fact exist in SH3...
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Even if they exist, you can't know that they are there without instrumentation. I'm not sure if Uboats were so equipped.
For US subs at least, they were (after a certain stage of the war) equipped with bathythermographs, simple devices to monitor water temperature outside the sub. So the skipper could actually be aware of a gradient and use it to hide under. This was in fact implemeted in SHI, so there is no excuse in my mind for it not being in SH4.