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A concept in development at NASA’s Jet Propulsion Laboratory would allow potential planetary missions to chase interesting clues in subsurface oceans.
Someday, a swarm of cellphone-size robots could whisk through the water beneath the miles-thick icy shell of Jupiter’s moon Europa or Saturn’s moon Enceladus, looking for signs of alien life. Packed inside a narrow ice-melting probe that would tunnel through the frozen crust, the tiny robots would be released underwater, swimming far from their mothercraft to take the measure of a new world.
https://www.nasa.gov/feature/jpl/swarm-of-tiny-swimming-robots-could-look-for-life-on-distant-worlds
