The next task for Cross and Green is to manually raise the prototype displacement beacon in the Gamma Labs to the surface, so it can be activated. Keller reaches the main lab area, but cannot raise the beacon from where he is because of an obstruction. After accessing the labs via the drainage canals, Cross and Green travel through the lower levels of the labs, encountering and battling HECU soldiers and Xen creatures as they go. They reach the beacon, clear the obstruction blocking the beacon from ascending, and successfully raise the beacon.
