Find a way into the Weyland-Yutani Facility to save Bella in A:CM
"Find a way into the Weyland-Yutani Facility to save Bella" is a mission objective in the game Aliens: Colonial Marines
You must find a way to penetrate the Weyland-Yutani Facility to get the cure that Bella needs, as well as to find the Personnel Manifest for Captain Cruz
Run through the surface of LV-426, go into cover if you see a dropship hovering above
Eventually you will get to the entrance of the Weyland-Yutani Facility
After going down the elevator, enter the Access Tunnel and go through a series of caves until you reach the structure of the facility.