Are there underground oceans under the, er, overground, oceans?

Such particles presumably are frozen spray from the salty underground ocean.

These underground oceans can potentially harbor life, and evidence for their presence was one of the most important discoveries made in the 1990s by spacecraft.

Europa's underground ocean was later confirmed by the spacecraft Galileo.

And there is no surface in most of this underground ocean.

There, they find an underground ocean of fresh water.

They build a raft and begin crossing the underground ocean, but soon encounter a pack of Xiphactinus.

They soon find themselves at a giant underground ocean where the laws of science are constantly redefined and prehistoric creatures are in abundance.

This could mean that the deeper layers of the ice have melted to form a vast underground ocean.

Callisto, another of Jupiter's moons, has a similar magnetic field, and is now also thought to have an underground ocean.