Open Hangar Doors
Hollenbeck is waiting on the top with new task for you. You must open the hangar's door to make a passage for allied soldiers. Go through only unlocked door and move ahead. After short walk connected to the extermination of the monsters, you'll find first elevator (#159), that can take you to the top.
After opening the door, you'll find yourself in the place, where you met Hollenbeck for the first time. Open the gate marked as 'HANGAR 3' and wait until the control panel pulls out (#160). One click should lay out the bridge. Go to the door, located on the other side.
Move ahead and stop when you'll find yourself in the huge room. The door of the hangar is located here. Click on the panel (#161), call for elevator and travel down. Go through the door and use the next lift. Save the game and prepare yourself for the fight from two Light Tanks. Tips are the same like previously - hold far from both enemies and attack them from the safe distance. They are relatively tough (after all, an upgraded Railgun needs few perfect hits to destroy one of them). In desperate situation, use Dark Matter Gun. If you need to recover health, the Stroggos' machine is located on the other side of the room, directly behind the wall opposite the elevator.
When you get rid of enemies, use the next elevator and travel to the top. In the small room, push the only active button (#162). Finally, the expected cavalry should arrive.
You must find Rhodes to execute another task. Unfortunately, the giant monster will appear in the hangar (#163) and completely destroy humans' plan. Don't shoot in new enemy's direction, but patiently wait until it flies to the top. Than use the elevator, and walk on balcony around the whole room. You'll see soldiers' group - one of them is trying to resuscitate the colleague. Find the engineer in the team. He'll upgrade your HyperBlaster. From this moment, energetic bullets can bounce off walls. Now go trough the door and meet Rhodes.
Locate Security Station
You're located n the bridge created round the core. Don't turn right and run straight ahead (gate marked as ROOF-55). After a while you'll encounter the elevator - traditionally use the button to call it (#164). Prepare yourself to the fight against elite Stroggos soldiers' team (Tacticals). Enemies will show up in the same door, which you have passed earlier to find yourselves here.
Travel up and find next elevator there. You'll get at the tower's roof. Wait until the hostile transporter will drop new enemies and eliminate them (for example with Railgun). After the fight, run to the other end of the roof. Push the button on the interface (#165). The first tower will become active now.
Return to Tram Station
Return to the elevator and travel down. Bothered by nobody, go into the next cabin to leave this level for good (#166).