After Translation Edit: FYI supercavitation is a real technique. Basically it reduces drag in water by covering the vessel surface with bubbles. It does create another issue: there are no water for the propeller to push so rocket have to be used. You might recoginze this term from Arpeggion of Blue Steel.
FYI FYI if you think supercavitation sounds crazy, get this, mantis shrimps cause supercavitation when they strike their claws.
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