BioShock Infinite: Burial at Sea – Episode One available today

BioShock Infinite: Burial at Sea – Episode One, the first of a two-part story DLC that sees Book and Elizabeth visit the underwater city of Rapture on the eve of its fall from grace, is available today for Xbox 360, PS3, and PC.

And to celebrate today's launch, Irrational Games sent over a trailer that highlights the story in which Elizabeth enlists Booker DeWitt's services in locating a lost girl by the name of Sally.

Who is this girl Sally, what does Booker know of her supposed fate, and what is Elizabeth's connection to this mysterious child? Find the answers to these questions and more in this new addition to BioShock Infinite, built nearly from scratch by Irrational Games.

Unfortunately, Episode One hasn't been getting the best reviews, but I'm excited for it nonetheless. The Burial at Sea episodes cost $14.99 each if you haven't already purchased the Season Pass.