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Book Nineteen of The Oxygenless World. On the Tibetan Plateau, inside an underground base carved from a former strategic reserve and code-named the Ark, Chen Yuanzhou, forty-five, chief engineer, seals the first large airtight habitat on Earth. Outside, oxygen has fallen to seven point eight percent and is still sliding; inside, twenty point five percent. Two thousand seats, three thousand names. The safety factor was cut from one point five to one point two to free two hundred and twenty tonnes of steel and buy eighty more seats. The seal was designed to leak below one hundredth of a percent per day, measured eight thousandths at 1.3 atmospheres, and the F-7-023 flange later shows a crack one hundred and fifty times too large. The Sabatier loop — CO₂ plus four H₂ to methane and two water over nickel at four hundred degrees — was built for eighty-eight point three percent and falls to eighty-five, eighty, then fifty-two. The micro-reactor carries twelve thousand kilograms of uranium oxide, rated fifteen years. There is no after. In the margin of the Ark assessment Chen writes: if the seal holds, people do not need hope; they need the date the air runs out. Then he admits the sealing is temporary and points east to Hokkaido, where Tanaka Yukiki will pull nickel from scrap and make the next catalyst.

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