Volcanic cave settlement

Overview

Schematic of a Volcanic Cave Settlement

The Volcanic Cave Settlement is based upon the discovery of caves in the surface of Mars near an extinct volcano.

The concept utilizes lava caves for shelter.

Unmanned preparation of a natural cave

Automated construction of a habitat using a natural cave

First the cave is tested for stability with a series of small detonations, forcing loose rocks to fall down. The cave might be shaped a little to remove some prominent noses and to create an even ground.

The entrance is then sealed. The shape of the seal is temporarily supported by means of a balloon, which is sprayed with several layers of polyurethane foam and fiberglass. A pre-processed airlock is integrated with the balloon.

A layer of polyurethane foam is also sprayed upon the entire inner surface of the cave, providing an air-tight and thermal insulating skin.

Now the cave can be filled with soil and air. The bottom is covered with powdered regolith, enriched with fertilizer and moistured with water. An appropriate air pressure is created. A small amount of terrestrial soil implants microbes. Seeds of pioneer plants are brought in to transform regolith into mold, which takes several years. The cave is artificially lit and heated.

There may be dangers associated with creating a habitat in a cave, such as the cave collapsing due to groundquakes, poison gases that seep through the walls, and possible contamination of any native life.