末日废土时代，已经没有可供呼吸的新鲜空气，人类大量灭绝，剩余的极少数人类精英通过方舟计划冬眠在地下的庇护所内。两位工程师在此负责起了庇护所的日常维修和危险检测工作，但一切并不是想象中的那么顺利...In the near future, breathable air is nonexistent. Virtually all of humanity has disappeared and those chosen to reestablish society reside in a controlled state of suspended animation. Two engineers (Norman Reedus and Djimon Hounsou) tasked with guarding the last hope for mankind struggle to preserve their own sanity and lives while administering to their vital task at hand.