Quarantine is shortened for Quarantine Zone a campaign level that is featured in Halo 2. The mission takes place in Installation 5, you will take control of the Covenant's elite trooper, the Arbiter. As the Arbiter, this is the only level that features the ability to take control of human vehicles. The mission is fallowed by Gravemind, and to some individuals it is one of the hardest and longest level ever.
You will fight Flood, Forerunners and some UNSC marines. The Sputnik Skull can be gained in this level in the Legendary difficulty. This level won't be an easy mission, there is a lot happening, a lot of Flood in vehicles and enemies with rocket launchers. Using Vehicles in this level is essential, the Gondola is preferred.