Osiris is separated from Blue Team and must race to catch up.
When Osiris is near the elevator they learn that Sloan has joined Cortana's cause. After the Guardian smashes the elevator and kills all non-Spartan humans, Osiris rushes upwards through narrow catwalks.
|Escape||Complete mission 6||10G|
|Fire Drill||Complete Evacuation within 18 minutes on Heroic without dying.||10G|
|Savior||Keep 6 miners are alive at the elevator in Evacuation on Heroic.||10|