That very well could be, and if it could be found, it could be fixed.
As for the signiature, it functions much like periscopes do. The smaller your profile and slower your speed, the harder it is for them to detect you.
If you turn map labels on, you can actually see them shrinking just by dropping to 7-8 meters.
I'm not sure if that's based on simply visibility, or sound as well. They seem to have modeled both in the game as far as detection radius goes.
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