Nasa has successfully trialled of a new type of underwater drone which seems to suggest one way it might attempt to explore under the ice of Saturn's moon Titan.
The rover is designed to float underneath a sheet of ice and drive around in the liquid (or perhaps water) below.
Nasa said it's the first time that an untethered drone has been controlled under ice by satellite link.
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The drone might also be considered for future moons to explore Jupiter's moon Europa, often considered the best chance for finding life in our solar system.