Jack is the sole survivor of a plane crash in the middle of the Atlantic Ocean. What would mean certain death is turned around into an adventure of both survival and curiosity, as Jack discovers Rapture, an underwater city constructed by business magnate Andrew Ryan, on objectivist principles. However, the city that was once meant to be a utopia of freedom has collapsed in a ruin roamed by the denizens of Rapture - now addicted to ADAM, a chemical that alters the DNA to give its user superhuman powers.

BioShock sets players loose in a fully original, underwater city as they fight off Splicers and explore the city to find out what brought about its ruin - and how to escape from it.