Crow's Nest

Crow's Nest is the third campaign mission of Halo 3.

Upon completing it on the Normal, Heroic, or Legendary difficulties, the player will earn the "Holdout" achievement and 20 Gamerpoints.

Background
It takes place in a UNSC Base is inside a cave, which "comes under heavy fire" from the Covenant Loyalists. Unable to sufficiently fight off the invaders, Miranda Keyes has a bomb placed in the operating room. Despite an attempt by the Covenant to disable the bomb, it goes off successfully, and all remaining troops, including the Master Chief escape into the base's garage where they survive the explosion.

Trivia

 * There is a argument between two marines who sound exactly like Tucker, and Doc from Red vs Blue


 * It is seen in the Halo 3 ViDoc Et Tu Brute around the 5 minute mark.