This is an image of Europa.
Click on image for full size
NASA
Thus there is as yet no answer to the question of whether Europa has an ocean, but the idea that water might exist under the surface remains an attractive theory with which to explain the features which we have just presented to you. In other words, even though an ocean might not exist at all on Europa, there is no evidence as yet which conclusively rules the possibility out. More exploration is needed to positively answer the question.
Read the Exploratour on NASA's Exploration for Life to find out more about a future mission to Europa. Read the Exploratour on life on Earth to find out more about possible life forms which might exist in a Europan ocean.
This is page 20 of 20