Difficult to say, remember that hatch is in the casing, not the pressure hull, it would seem pointless running a pressure discharge out there when you could just vent it into the free-flood space.
Could it be a fairing over a tow point?
Of course I'm not suggesting russian boats are uneliable, but that crest in the first photo is actually the russian breakdown service badge :O)
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DOLPHIN 38
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