On Saturday, October 23rd, 2077, the bombs fell. A crack team of rollercoaster designers went deep underground to ensure that, when radiation levels fell to safe levels and humans returned to the surface, the great theme parks could be rebuilt. However, their descendants had other ideas. Finding life underground far preferable to life above it, they started playing OpenRCT2 and made a pact never to return to the surface… Welcome, ladies and gentlemen, to Vault 73.