Saturn's moon Enceladus has a global, water-based ocean
 

Scientists have suspected for a while that Saturn's moon Enceladus has a giant water ocean, and they now have some hard evidence to support their theories. Thanks to the Cassini spacecraft, NASA has discovered a "very slight wobble" in the moon th...

http://www.engadget.com/2015/09/15/e...-global-ocean/