This level is a small hope spot for Philip, but it is still just an isolated world.
Hanger[edit]
Behind the starting area, opposite of the hanger, there is a small cavern with a control panel. Press the door button to open the hanger door. You will need to keep this door open as well - locate an object that you can wedge in the door. There are two black boxes in the hanger, or blue barrels in the storage room opposite the radar dish. With the door wedged open, head into the cave again, and press the hatch button. You can now enter the hanger. If the items are dislodged after entering, you can use the switch next to the door to open it.
In the hanger, find some boxes to climb the shelves and jump over the fence. Head to the switch at the back of the hanger, and flip it to unlock the fence gate. Find the battery in the middle, and bring it into the control room to restore power. Also, find the fuse within the shelves of the fenced section - this will be needed at the radar later.
Radar[edit]
THe large building on the left is the radar building.
First, push the metal contacts on the ignitiion system together. One of them will jam - to fix that, head to the storage shed opposite the radar dish, and find a metal pipe in the middle shelf. While you're in the shed, get the portal key in the corner.
Place the metal pipe in the contact, and start the generator. When the fuse bursts, insert the replacement fuse and restart the generator.
Head into the hanger's control room and use the computer. Run the satellite dish program. Calibrate the signal and send the message.
Helipad[edit]
After the signal is sent, the portal key is delivered on the helipad but enclosed in a box. Exit the hanger and climb to the helipad to get the box. Bring it in the radar area, and place the box in the grinding gears. The key will be released.
THe last task is to find the artefact. It is in the corner, opposite the hanger and behind the radar dish. You may also discover that it's possible to escape past the bounds of the facility - if you do, you'll be teleported back in.
With nothing else to collect, head to the exit. It is located within the hatch in the hanger - if it's closed, you need to ensure the hanger door is jammed open with an item, then open the hatch in the cave to the south.