We keep the ship’s oxygen at 4% lower than standard during training runs. Hypoxia lowers cognitive resistance. It makes the brain pliable. It sounds cruel, but it is kinder than the alternative. If a trainee panics in high-ox, they hyperventilate. In Underspace, hyperventilation turns your exhaled CO2 into visual spiders. I have seen a 200-ton freighter crash because the pilot tried to swat a spider that wasn't there. Low oxygen keeps the hallucinations abstract (shadows, whispers) instead of tactile.
In the world of Underspace , "space trains" are a central mechanic for travel and economy. Understanding how they work is vital for mid-to-late game efficiency. underspace trainer work