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Breaking Quarantine is a campaign achievement in Halo: Combat Evolved Anniversary. This achievement is obtained when a player escapes the Forerunner facility on the level “343 Guilty Spark” in 21 minutes or less.
- The name of this achievement is a reference to a story featured in the Halo Graphic Novel, detailing Johnson's escape from the Flood Containment Facility on Installation 04.
- Escaping the facility within 21 minutes may be a "7" reference as 21=7x3. However, this is highly unlikely as the game was made by 343i rather than Bungie. 343i has yet to develop Bungie's love of the number 7.