Just as the last light flickered toward darkness, a loud clunk echoed through the shafts. Stinky let out a muffled cheer through his mask. The new Electrolyzer hummed to life, venting a fresh, cool mist of oxygen into the main shaft. For now, the pressure was holding.

"Oxygen levels at twelve percent," the colony AI chimed with terrifying politeness.

On the floor above, Mi-Ma was running on a manual generator until her legs turned to jelly. Every rotation of the wheel sent a tiny pulse of power to the Carbon Skimmer, which was currently the only thing keeping a rising tide of Carbon Dioxide from drowning them all in their sleep.