Instructions
Begin at the headquarters. Grab the HMG-90 and the Grenader and walk to the purple sphere to find a vehicle. Take the left turn toward Bay Door 2 and exit through the tunnel. Turn right under the bronze pipe and drive until you reach the brick wall. Jump out and leap over the wall on the right.
Run toward the yellow cylinders and walk up the ramp beside them. Head up the curved ramp and kill the enemies at the top. Keep walking up the path until the it divides. Turn right to find the first pressure switch. Destroy it with your gun.
Walk where the switch used to be and look for the red pipe. Jump down and head behind it toward the bronze tube emerging from the ground. Jump in and then head down to the ledge of the building inside. Take the left to the walkway and defeat the enemy the on top. Shoot the second switch to destroy it.
Jump from the ledge where you destroyed the second switch. Grab the next ledge and leap ledge-to-ledge until you get to the top. Destroy the final switch at the top. Leap to the building straight ahead of the destroyed switch. Climb to the roof and sneak around the sides. Use your HMG-90 to wipe out Sovetnik's guards. Fire your Grenader at Sovetnik when you get close to lower his health. Finish him off with your HMG-90.