You have now arrived at the train station. Head up the ramps, and you will enter a massive city. There is a main road through the city that you must follow, but take it slow and methodically, taking out droids one at a time, so they don't gang up on you. You'll head along this road for quite some time, winding right and left, until you finally come to a dead end. On the street is a metal grate that must be shot to proceed.

When you reach the dead end of the street, look down and shoot the metal grate to open the route to the next section of the level.

Proceed down the shaft after the grate has been blown and then travel through the metal shaft behind you. At the first junction you come to, make a right; then, make a left at the following one. Bypass the next junction and make a right at the following one. Take the next tunnel on your left and keep going straight, past another intersection, until you reach what appears to be a dead end. Look up and head up through the shaft above you, blowing the grate to get out. You are once again in the city. Travel along the main avenue, and you will reach a door on the ground level. Open the door, head past the next door, and you will arrive in a large courtyard that is home to the tower.

The PTMC tower

Fly into the tower through the open portal on the lower level, go through the door, and you'll arrive in a small chamber with a platform. Get on the platform and activate your data cartridge to transfer your information to Suzuki. When the transfer is complete, exit the tower the way you came in and prepare for a big battle with two PTMC mercenary ships. Unload your homing missiles and use the most powerful weapon at your disposal to take on these ships. Use the surrounding terrain to hide behind objects and avoid incoming fire. As long as you keep moving and aim your missiles with care, the mercenaries will finally be destroyed, ending the level.

Next: Chapter 5 - Red Acropolis Research Station