Premise : Foreseeing the destruction of the Earth, humanity builds a multi-generational starship called Earthship Ark, 80 kilometres (50 mi) wide and 320 kilometres (200 mi) long. The ship contains dozens of biospheres, each kilometres across and housing people of different cultures; their goal is to find and seed a new world of a distant star. More than one hundred years into the voyage, an unexplained accident occurs, and the ship goes into emergency mode, whereby each biosphere is sealed off from the others.
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