The year is 2045. An unknown entity has invaded Earth and pushed humanity to the verge of extinction. Cities have been reduced to rubble. The remnants of civilization have retreated underground. Human survival is now measured in basic instinct and constant fear. Among the survivors, a small number of scientists are still working toward a solution rather than simply enduring. Their answer: a seven-layer platform constructed deep underground beneath a ruined megacity — part laboratory, part battlefield — designed as a final effort to reclaim the planet.