Climate of the planet Tau Volantis (Dead Space 3)

Judging by one text document that lies in the room for the first receipt of the Arctic suit, the cold wind, if the spacesuit is damaged, can instantly kill a person, it turns out that the climate there is more severe than in our earthly Antarctica. but there are many moments in the game where the heroes walk in the open air for a long time without helmets. why don't they die then?