M.A.R.S.base Lavapolis is an initial metropolis located within the lavatubes about and including Rahe crater at the base of Ceraunius Tholus.

The Architecture deploys the Modular Assembly Reusable Structure (M.A.R.S.) system, of circular ridged support members, that connect cylindrical pneumatic shell membranes and hemispherical endcaps, to create expandable habitation modules that enable extendable volumes with various floor levels,