Proceed to the room with the Brute - kill it and enter the corridor behind, flicking the switch and taking the elvator down. Simply follow the corridor around to the two forcefield generators, turn them off and head back.

On the way, you will experience a terrifying ambush and make your way back to the room with the Brute.

In the top right hand corner is a small, dark cave that contains armour. Grab it and head through the crystal-lit corridor - in the next room, the forcefields are now inactive so you can carry on through the door.

When you reach the lava area, kill the Brute and Skaarj that you find and follow the Nali to a secret stash. Locate the gap with the red button at the far end, shoot it and make your way across the planks. In the next room, shoot the barrels, kill the Skaarj and head through the opening - kill the Brute, flick the switch and depress all four arrow-shaped buttons on the central column.

Mind the Skaarj, go through either of the now-open doors and take the lift up. Pick up the stinger, head to the next corridor and shoot the barrels in the next room. Carry on, find the red button, press it and take the platform up.

Head to the room full of empty carts, go forward through the corridor and drop through the hole in the ground. Head to the lava room, cross the rickety bridge, find the dispersion pistol power-up, locate the generator rooms and look for the two red lights. Go right from here, pull the switch, go up the elevator and across the platform, taking care not to let the fans blow you off. Shoot the glass, press the buttons.