Commons B-01

Commons B-01, also named Commons Blue, is a generic United Nations Space Command term for one of the commons modules on the port side of an Orbital Defense Platform. It consists of a standard-sized rectangular room, with "islands" regularly spaced to the edges of the room. Security B-01 overlooks Commons B-01. It is also adjacent to the Armory.

Cairo Station Commons Blue
Cairo Station Commons Blue was the United Nations Space Command portside commons of Cairo Station farthest from the bridge. During the Battle of Earth, Covenant boarders invaded Commons Blue, cutting down the Marines there with Plasma Cannon fire. By the time the Master Chief arrived, all the Marines were dead. SPARTAN-117 had to fight past several lances of Unggoy and Sangheili as well as a number of Plasma Cannons.

Trivia

 * The Thunderstorm Skull can be found in here.