in challenge of atlas i have found one shield underground but i can't find the shield, but i think it's behind the swiveling door. the problem is none of the enemies are heavy enough to keep the door open and the bundle of boulders is too heavy and you can't keep the door open...PLEASEEE HELP!
There is a chest-like object you have to pull into the room.
What you do is, get in front of the door that opens, and you KICK the chest thing towards button, and it should land on it and open the door, then you run into it. If your quick enough you should make it inside.
Now, It's been a while since I beat GoW so I may be somewhat wrong but I think that's the proccess. If it isn't just go check Gamefaqs.
That is exactly what has to be done as i played that exact part one hour ago and that was how i did it.