Gassed Up

After finishing 'PACT WITH RAIS', Alfie will contact you. Head to his location, which is surrounded by Biters. Jump over the right side to reach him.

Talk to Jeff. He will instruct you to go to three locations to turn valves.

First Location (Trainyard): The entrance is blocked by a barbed wire fence with a Big Guy inside. Go to the overpass, where you'll find an Acid Zombie. Jump down into a garbage pile to deal with the Big Guy. Turn the valve.

Second Location (Under Overpass): Two Bombers guard this area (one outside to the right, one in the middle). Be aware that Runners will be attracted. When you head to the valve, you'll need to fight 6-8 Biters and 1 Acid Zombie. Turn the valve.

Third Location (Tunnel): 7-9 Biters are inside. They have a single path to attack, making them easier to manage. Kill them all and turn on the valve.

Return to Jeff. He will then tell you to go to the main place to turn on all the gas.

Head to the main location. You'll see a Big Guy below, but you can't reach him directly. Find a pipe that leads outside. Follow the pipe backward to find the entrance.

Enter the pipe and face the Big Guy. Stay within the pipe to avoid damage and hit him. Once he is dead, turn on the last valve.

Escape the blast. Return to the Station to turn off the SAFETY VALVES (blue pipes). Go to the right of the main building and follow the fire to each valve to turn them off.

Once all valves are off, return to Jeff. He will kill himself. You have 10 seconds to escape the area before the station explodes. Get out of range and watch the fireworks.