"Find a way into the Weyland-Yutani Facility to save Bella" is a mission objective in the game Aliens: Colonial Marines
Briefing
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
Missions
Locations
Walkthrough
For Bella
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
One Bullet
After going down the elevator, enter the Access Tunnel and go through a series of caves until you reach the structure of the facility.