Pumping Station 1

Pumping Station 1 is the first facility that needs to be activated in order to flood the Strogg power plant with toxic waste. The area consists of several rooms along a primary passageway and a system of other rooms and water canals accessible from damaged infrastructure.

One the water pipes leads to a large outdoor area, which connects to several other corridors.

Quick Level Completion
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Walkthrough
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Differences from Easy to Normal
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Differences from Normal to Hard / Hard+
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Secrets

 * #1) After going up the elevator, clear out all the enemies in the area and go back to the room atop the first ramp (where the pipes, crates and flickering yellow light are). Shoot the aforementioned light to blow up the crate to the left of it that's atop two other crates, and jump up there using the explosive barrels to grab the now-exposed Adrenaline. If the barrels were blown up during the battle, you will need to rocket jump to it.
 * #2) In the exact same area, look at the pipes just to the right of the stack of crates where the Grenade Launcher sits; there is a cracked pipe that you can blow up. Do so and jump inside it to be taken to a secret room with Technicians, another Adrenaline, and another pipe you can jump into to exit the room.
 * #3) Take the pipe exit from Secret #2 out to a big, outside area. There are two grates out here; one directly in front of you in the water and one way up above it, on a back wall. Shoot both of these to open a secret compartment with a Quad Damage. Be wary, as grabbing this will unleash a group of 6 Flyers on you (in 2 groups of 3) as well as a Gladiator that comes out of the door up here.

Differences
A teleporter appears on this map in deathmatch mode, which can be found where the player activates the pumps in single player mode.