Zombie Stronghold. 100 years after the undead covered the globe, the infected and the risen are deeply entrenched in mountains of smoldering junk.

Siberian Summer. The first known Undead Fortress is one massive bonfire of wreckage in the Tunguska area.

LZ All Clear. A UNSC Vulture makes an emergency pickup near a massive Forerunner ruin on Onyx.

 Dyson Rappel. Kelly explores a caldera-like opening in the surface of the hollow planet.

 Canyon Runners. Specialized 'mechs transport a demolitions squad to a secret base entrance.

 Poison Valley. An explorer in mechanized HAZMAT gear tops a ridge, only to discover the dead city below.

 Ganymede Base. Plan views and idea development for a large installation in a rocky waste.

 A wrecked Covenant tank on Onyx. The remains of an EPA mechanized suit. Polar refinery. Flood experiment chamber.