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General
UUV-ISR200 small unmanned underwater vehicle.
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One more image of UUV-ISR200.

UUV-ISR200 small unmanned underwater vehicle.
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Bionic manta ray UUVs developed by Northwestern Polytechnical University. They are covered with an innovative elastic skin and mimics the swimming motions of manta rays, which enables a high-degree of endurance compared to traditional UUVs.
How are we confident this is an (X)XLUUV? It's something like eight times larger than the Orca XLUUV. Assuming it's single-hulled, there's enough space inside to accomodate a small crew. The WW2 German Type VII has a similarly-sized pressure hull.