Subsurface

We thought Enceladus was just boring and cold until the Cassini mission discovered a liquid water subsurface ocean.

The mysterious bright spots on Ceres, which have captivated both the Dawn science team and the public, reveal evidence of Ceres’ past subsurface ocean, and indicate that, far from being a dead world, Ceres is surprisingly active.

Europa is thought to have subsurface liquid water.

Overcoming severe radiation damage, the redoubtable orbiter has deployed a probe into Jupiter's atmosphere; studied the hottest volcanoes in the Solar System on Jupiter's moon Io; discovered evidence of subsurface oceans on the moons Europa and Ganymede; and provided new insights into the giant planet's stormy atmosphere, gigantic magnetosphere and energetic particle environment.

Before we could lay the flooring we had to lay a subsurface under it to keep it flat and support it.

variations in subsurface conditions