Bioshock begins as your plane plummets into icy and uncharted waters and you are forced to enter a lighthouse oddly located in the middle of the ocean. Discovering a primitive diving bell inside the structure, you board it and travel to the bottom of the ocean and into the haunting world of The Rapture.

You discover that The Rapture was once a utopian society created shortly after The Second World war for only the best scientists, doctors and artists, but has been ravaged after a war over Adam, a genetic enhancement that gives people almost superhuman powers.

Arriving after the great genetic war, the player finds the civilisation battered and blood-soaked, home only to those humans who were mutated beyond imagination by the very weapons they used in their great war.

As the player proceeds through the dark and violent society, they will encounter many of the mutated beings left over from the conflict, from small girls who feed off the dead to create Adam, to the Big daddies- huge biomechanical creatures armed with deadly weapons.

The player will pass through the underwater buildings and harness Adam to mutate themselves like the residents of The Rapture to gain control of new weapons ranging from telekinesis to the ability to produce fire from your hands.

The Rapture itself is rusting and decaying, creating a city of fear without light, smeared with blood and filled the screams of its former citizens. As the game progresses, the player must employ new tactics to defeat some of the more heavily armoured members of the nightmarish underwater colony. The Big daddies will not go down easily and you will have to take advantage of your environment as well as your mutations to finish them off once and for all.

You will be met with the most important of choices: save the civilisation or exploit them to allow yourself to escape their hellish world.