After fighting up the hillside, youll reach a helipad where youll encounter drones. After getting the objective to take control of a drone, look left of the machines for a side-room containing intel.

Entering the underground base, look to your left as you enter a room with a large staircase on the far end. Just left of the entrance is a small reception desk through a window. Look inside, you can take the intel through the window without having to find a way inside the room.

Eventually, youll meet up and rescue a scientist. Enemies will then pour in. After taking the bad guys out, cross the room and look through the door all the intruders came from.