Keyes is the ninth campaign level in Halo: Combat Evolved. In this level, the Master Chief returns to The Truth and Reconciliation to rescue Captain Keyes. The Master Chief fights his way through the ship and on the ground while trying to survive the bloody engagement between the Flood and surviving Covenant forces. At the end of the level, the Master Chief discovers a horrifying truth: Captain Keyes has been completely taken over by the Flood. With no other choice, the Chief physically removes the Captain's implants which contain the access codes to The Pillar of Autumn. He then hijacks a Banshee and escapes.