Cutscene opens to the Spirit of Fire going through the split seen in the last level. Sentinels continue to fly around the Spirit. One flies in front of the bridge and observes Captain Cutter before flying off.

  • Serina: This is all part of the plan... right, guys?

The ship continues to fly through what appears to be a massive underground Forerunner structure.


  • Cutter: Serina, report! What's going on here?

Two Sentinels fly towards where the Spartans, Forge, and some Marines fight off Flood. Flood Dispersal Pods start dropping everywhere, one of them hits one of the Sentinels.

  • Serina: "Best guess, we're being pulled through some sort of docking system. That alien life form followed us in, we have a significant infestation on the aft quarter."
  • Cutter: "Forge, get out there and get those things off my ship! You can requisition troops from the airlocks on the deck, if we lose those airlocks, we'll be defenseless."

More Sentinels fly in, as well as a couple of Protectors being lead in groups by Sentinels.

  • Serina: "Those aliens are dropping pods on the hull from all around us, keep watch for them."
  • Serina: "Alien population on the hull is increasing, and the structure is reacting, more of those drones inbound too."

After several Sentinels have been destroyed:

  • Serina: "Bad news, I intercepted a signal from the alien AI. Those drones have declared us a threat and are massing behind us."
  • Forerunner AI: "Decontamination sequence commencing."
  • Serina: "Sergeant Forge, get your men into the airlocks. Something very bad is coming."

A ring-shaped energy field starts up clearing away the Flood from the Spirit of Fire.

  • Serina: "The energy field is reacting to the aliens, it's trying to clean our hull, take cover out there!"
  • Serina: "Captain, if our air units fly through the ring in the opposite direction it will minimize damage."
  • Serina: "The drones and the cleansing ring seem to be able to remove the aliens if they're already damaged."

Every time you pass through a ring a countdown begins to show how much time you have to the next ring. This will continue until all the Flood is cleared off the ship, every time you approach a ring the Forerunner AI will talk about decontamination and Forge or Serina will warn you about the ring or to take cover :

  • Forerunner AI: "Decontamination sequence commencing."
  • Forge: (second ring) Take cover! Another cleansing wave is coming."
  • Forge: (third ring) "The ring is back!"
  • Serina: (fourth ring) "Take cover!"
  • Cutter: (after third ring) "Two Vultures have just finished repairs, they're yours to command."

When enough Sentinels are killed, Super Sentinels will show up to help the Regular Sentinels and Protector Sentinels.

Once all Flood forces is cleared away:

  • Forge: "All clear! The hull is clean."
  • Cutter: "Serina, maximum power to the engines. Get us out of here!"

Level ends.