Chinese Unmanned Underwater Vehicles (UUV)

broadsword said:

Is 140dB a mistake? It is louder than a military jet aircraft taking off from an aircraft carrier deck.

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Underwater decibel is different from normal decibel. Underwater decibel is basically normal decibel + 62.
And really, what they mean by "<140 dB". The speed and the context would be important here. Is that a discrete component or broadband noise? 140 dB is, nevertheless, a lot. If it is the strongest discrete component in slow speeds, it equals WW2-era SSKs. If it is broadband noise at 12 knots, then the thing equals the Kilo (877) class. Such a wild gap...

Maikeru said:

Covert Shores article on newly seen UUV. He says China is leading in this new technology.

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Maybe this is what sank in the Yellow Sea last year instead of the Type 093.