Act 3 chapter 3

Ok so idk if this has been posted already but when you get to the part where you have to follow the nose cone of the rocket, after you go threw rhe little section with the slide down and kill some swarm, then u gotta duck under a section to proceed i go threw and nothing happens im in a large “room” with tanks and such nose cone is no where to be seen, i go to the next door but it isnt there and all i can see is a white ground section with blue sky and clouds. I can walk threw the tanks, sand bags, and most other stuff.