Fics like Oxygen

In the year 2299, on a transport ship in deep space, three million people slept. They waited, frozen inside egg-like pods, waiting for the day they could safely wake up—the day they could go home, when Earth would be safe again. If the systems on the ship were left unchecked—if something went wrong—for forty-eight hours, then two people were selected. Their duty: to assess the ship, find the problem, and fix it. Wannabe-Engineer Dean Winchester and Reluctant-Medic Castiel Novak were taken out of hypersleep. The ship's failing oxygen system meant three million humans were in danger. And that, it turned out, was the least of Dean and Castiel's worries...

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