Mars - Underground

: Allows you to expand your colony into Martian caves and lava tubes.

If you're looking for the by Dr. Robert Zubrin , it outlines the "Mars Direct" plan. Mars Underground

Mars Underground by MarsUnderground - Itch.io : Allows you to expand your colony into

: It requires roughly 300 MB of space and runs on Windows 7 or newer. 2. Surviving Mars: Below and Beyond (DLC) Mars Underground

: Works in tandem with underground play, allowing you to fetch exotic minerals needed for advanced "Wonders". 3. The Mars Underground (Documentary)

: Features expert insights on using Martian lava tubes as natural radiation shields for future human habitats.

: Includes rare, randomly spawned structures like the Artifact Interface , which can provide colony-wide upgrades like global drone control.