Set ten years after events of the original, BIOSHOCK 2 sends players back to Rapture, an underwater metropolis that was founded based on principles of extreme capitalism and individualism. It's now 1970, and the city has lain in chaotic ruins for the last decade. Its doped up denizens have come under the thumb of Sophia Lamb, a brilliant but insane psychologist who teaches her crazed, cult-like followers that extreme collectivism is the right way to go. Players journey through this underwater madhouse as a Big Daddy. A major facet of the original game, Big Daddies are genetically altered men who have been surgically grafted to the interiors of hulking dive suits.