Enceladus is a small, bright, ice-covered moon with a global saltwater ocean beneath its crust; the ice shell is thick at the equator and mid-latitudes but thins at the south pole, where four long “tiger stripe” fractures vent geyser-like plumes into space.
A false-color photo of Enceladus, that highlights its ridges, impact craters and plains. wikimedia 
The south-polar terrain is the youngest and warmest, sculpted by tidal flexing into ridges, troughs, and fault-bounded blocks, and likely connected via fractures to a rocky seafloor hosting hydrothermal activity.
Away from the pole, older, more cratered plains are cross-cut by bands of ridges and grooves, while plume fallout mantles parts of the surface and supplies material to Saturn’s E-ring.
An artist's impression of a global subsurface ocean of liquid wate wikimedia 
# See
- Is Moon Life possible Under the Seas?
- Enceladus Power, Titan Power and Ganymede Power
- Icy Moon Missions
- google.com/maps/space/enceladus/ 