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Hangar 21 is one of the four new maps included in Battlefield 4: Final Stand. It is set in and around a secret military-hangar dug-into a mountainside in Siberia, where a prototype Titan is being built. There are several military-installations around the hangar.
Trivia
The map is referred to as Titan in the game files, referencing the vehicle being built in the hangar.
The bunkers and concrete walls protecting them are similar to the Swedish standard M90 splinter-camouflage pattern[1].
