Aliens: Hidden Sea on Jupiter's Moon Europa gives New Hope of Proof that Extraterrestrial life Exist
The sea - which is as big as the North American Great Lakes - is trapped below several kilometres of ice.
Researchers at the University of Texas made the discovery while studying images taken by the Galileo space craft. They found two rough areas on an otherwise smooth icy crust.
They believe the "crinkles" are caused by floating ice shelves that are collapsing into the water.
Lead scientist Dr Britney Schmidt said the breach in the icy shell could drag nutrients and energy down into the water far below.
She said: "One opinion in the scientific community has been: 'If the ice shell is thick, that's bad for biology - the surface isn't communicating with the underlying ocean.'
"Now we see evidence that even though the ice shell is thick, it can mix vigorously. That would make Europa and its ocean more habitable." Read More