From Halopedia, the Halo wiki
Sky bridge, known in game files as
Universe and lore
Sky bridge is set in an under-construction skyscraper in Seongnam, Korea. The city around the map features a number of other buildings including one owned by Cascade Stronghold Technologies. Due to the cancellation of Halo Online, the map is considered non-canon.
This map was set on a in-progress skyscraper while it was being built, with a layout similar to Gephyrophobia and Narrows. Each team's base lies at either end of the titular sky bridge connecting two towers together. It featured man cannons, Warthogs, Mongooses, Banshees, a fuel rod cannon, and a turret.
Sky bridge was never officially released for Halo Online, and information about the map is gathered from two main sources. The known images of the map come from an ArtStation portfolio upload by Saber Interactive senior environment artist Igor Kochnev, with filenames