A Secret Room Halo: Reach
1) Finish the objective and clear the area, it only works on LEGENDARY CO-OP.
2) Get your friends to get ready with a ghost to ram the six sword elites that come out of the door.
3) One of you has to grab a jetpack, and activate the switch at the location I show. The switch will open the door where your friend will ram them and not do what we did in the video.
4) Go in the door and it will teleport you to a path going to Halsey’s lab.