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But there's one possible use of supercavitation that's so wild it's barely on the radar screen -- exploration of Jupiter's moon, Europa. Magnetic and surface features indicate that this unique water world may contain under ice, an ocean vaster than all the seas of Earth combined.
As it is, NASA plans to land a probe on Europa's surface, melt down through the ice to the expected ocean below, and simply dangle there from a tether to get a sense of the waters.