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Underwater on Europa?

Underwater on Europa?
Underwater on Europa? A future mission to Jupiter’s moon Europa may deploy an autonomous submarine to explore Europa’s subsurface ocean to look for signs of life, concentrated either at ocean-floor hydrothermal vents or clinging to the ice-ocean interface. Loren A. Roberts for The Planetary Society

(Note that an actual Europa mission would probably not feature a tether, nor would Europa's under-ice ocean receive sunlight from above.)