And it was doable with the resources at hand. The Adamantine main colony site had some underground bunkers for food production that they had mostly stopped using once they got their oxygenating crops started under the air bubble; there would have been spare hydroponic equipment and growth supplies available. Even if this place hadn’t had its own still-functioning power source, the terraforming engines were right there to tap, and the terraforming techs among the colonists would know how.