BioShock Infinite: Burial at Sea Episode 1 Released and Trailer

Return to Rapture in a story that brings Booker and Elizabeth to the underwater city on the eve of its fall from grace
Releasing a new video, 2K and Irrational Games have announced that the first episode of BioShock Infinite: Burial at Sea, the second add-on content pack for BioShock Infinite, is now available for download worldwide on PC, PS3 and Xbox 360. BioShock Infinite: Burial at Sea is a two-part add-on campaign featuring an all-new story for Booker and Elizabeth, set in the underwater city of Rapture before its fall.
The combat experience has been rebalanced and reworked with a greater emphasis on stealth and resource management that merges the best parts of BioShock and BioShock Infinite. It includes a new weapon, an old favorite weapon from the original BioShock, the return of the weapon wheel, a new Plasmid, new Gear, and Tears.