Of course, they did not forget to prepare the territory itself, improving the already existing infrastructure. While it was miles ahead of its peers, there was no such thing as over-preparation.
For one, they prepared the tunnels well.
These tunnels were already lined with extra insulation from the extreme heat, and they only had to add heating sources, as well as make the places more airtight.
Unlike in the houses, the prismatic moss was already thriving there.
As subterranean plants, they were even healthier when planted in the underground farm. Like those in the houses, they would be used to provide oxygen, which was ample in this case.
The underground farms and the tunnel system were connected and would just have a metallic door whenever they wanted them blocked again, dividing them into sectors in cases of breaches, so there had to be self-sustaining farms in each section, just in case.
