This is an image of the Pwyll crater of Europa taken by the Galileo spacecraft.
Click on image for full size
Image courtesy of NASA
Soft Craters on Europa
The surface of Europa shows many signs of that there may be a submerged ocean. For example, this crater looks as if it was created by something that fell into a slushy layer.
Other signs of a submerged ocean include:
* flooded terrain
* spreading ridges
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