BioShock is a first-person shooter video game developed by 2K Boston (later Irrational Games) and 2K Australia, and published by 2K Games. Its sequel is BioShock 2. BioShock is set in 1960. The player guides the protagonist, Jack, after his airplane crashes in the ocean near the bathysphere terminus that leads to the underwater city of Rapture. Built by the business magnate Andrew Ryan, the city was intended to be an isolated utopia, but the discovery of ADAM, a genetic material which can be used to grant superhuman powers, initiated the city's turbulent decline. Jack tries to find a way to escape, fighting through hordes of ADAM-obsessed enemies, and the iconic, deadly Big Daddies, while engaging with the few sane humans that remain and eventually learning of Rapture's past.