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Sending a submarine to the bottom of the ocean on Jupiter's icy moon Europa is the most exciting potential mission in planetary science, according to one prominent researcher. Europa's seafloor may well be capable of supporting life as we know it today, said Cornell University's Steve Squyres, lead scientist for NASA's Opportunity Mars rover, which is currently roaming the Red Planet. So a Europa robotic submarine mission is at the top of his wish list, though it likely won't happen anytime soon.
A Europa submarine mission didn't make the Decadal Survey's list; it's just not feasible at the moment. If scientists want to tackle it, they'll have to overcome some serious technical and engineering challenges — such as how to get through Europa's icy crust.