Ice-penetrating radar will help JUICE and other spacecraft find water beyond Earth 

 When it arrives at Jupiter and the planet's moons in 2031, the JUICE spacecraft will use ice-penetrating radar to see beneath determine habitability. 

https://cdn.mos.cms.futurecdn.net/2mezXa3BcFM8P4JWpbMVUE.jpeg

https://www.space.com/esa-jupiter-moons-juice-spacecraft-ice-penetrating-radar