Androzani Minor

Androzani Minor is a dry, sandy planet close to Androzani Major. Androzani Minor is a desert planet, its oceans having dried up billions of years ago. Due to the unusual composition of the planet, boiling hot mud flows throughout the planet's crust, blasting its way to the surface in dangerous explosions. The planet is riddled with caves that have been excavated by the violent mud flows, some of which lack oxygen.

Despite the conditions of the planet, it has a breathable atmosphere and is home to some forms of life, such as the Spectrox Bats and the Magma Beasts. Humans also come to planet (it does not seem to have any permanent human settlements aboveground), mainly to gather the Spectrox found in the caves. (DW: The Caves of Androzani)