Objective: Extermination and Repair
The hi-jacker's guide to the galaxy...
From the satellite you arrive in a dark teleporter booth overlooking a circular room. Quietly kill the enemy personnel below from here, then jump down. A group of enemies will appear from a duct to the south, so be ready for them. Now open the large door and enter the long corridor ahead. Proceed slowly, as enemy marines will approach from all sides as you go. Kill them all and clear the room on the other side of the comm terminal too. Go to the end of the corridor and make a U-turn up the stairway and follow it to the end, where there's a 1x recharger. (Watch your back though!) Now head back to the large corridor and turn the corner into a large room at the end. Two walls will lower and some enemies will attempt to kill you, so take care of them quickly. Head back to the large corridor again, but this time take the elevator. Continue past a number of doors until you come to switch 1, which you must flip. You can now take the service duct to the south to return to the room where you entered; as you arrive a door opens on the right-hand wall to reveal a very useful 2x recharger.
Find the elevator and ride it again. Enter the corridor and take the door to the west (it's not immediately obvious as it looks a bit like a wall panel, but it's there). Then drop down into the dark chamber. You will immediately be surrounded by a large number of enemies, so be cautious. Once they have been taken care of, drop down into the small duct in the center of the room. You will come to a junction where you must first turn left. Go up the stairway, find switch 2, and flip it. Turn back, take care of the few enemies still around, and go back to the junction. This time go to the south-east, where you will find the entrance to a service duct. Find your way to the end (killing any remaining enemies in it), and head back to the long corridor from there. Take the lift one last time, and head south until you are almost back where you started: this time you will find the access door to the radio mast is open. Enter the mast and flip the switch at then end to complete the objective.
Congratulations!!
