Quake II/Pumping Station 1

Level Objective
The objective for this level is to fight your way to the pump control room, start up Pumping Station 1 and then proceed to Pumping Station 2.

Strategy
This is a straightforward level with a clear path from the entry to the objective and the exit. Any strategy will work so long as you are on the lookout for enemies at all times. At one point, you will have to walk into an ambush where it is difficult to find cover and enemies attack from an unexpected position. At another point, things seem rather peaceful, but this moment of calm is short-lived. Although the objective and exit are reached by a simple path, this does not complete the exploration of the level and to do that a secret area must be found. Ammunition, health and armor are all in reasonable supply.

Turning on the Pumps
Entering this level, you come into a passageway from the side. Going either to the right or to the left brings you to the same place - a room surrounded by a narrow gutter of toxic waste with large crates stacked in one corner. Four steps up take you from this room into another room with an elevator platform against the right-hand wall. Before you go up, pick your strategy for dealing with an ambush. You will arrive in a room with some Guards and no cover. Above your head there will be a landing with Gunners on it, so running forward will expose you to their fire. The exit from the room will be ahead and to the left, but that will take you up to two Berserkers in the next room. Whatever you do, you will probably take some damage. Try running for the next room and taking out the Berserkers before the Guards can follow you. However, keep away from the rear of that upper room. Now you have some cover from which to pick off the Guards. Finally, go back down and use the corner for cover as you take out the Gunners above on the landing with Rockets or the Rail Gun. (At this point, you can usefully refer to Secrets, below.)

Carefully, look between the tall pillars or pipes on the right-hand side at the rear of the upper room. When the patrolling Gladiator sees you, dodge back and kill him with Grenades or the weapon of your choice. There will be another Gladiator deeper into the next room. When that room is clear, advance through the pillars and look, again cautiously, into the pump control room, which is through the opening on the right. Deal with the Strogg there and turn on the pumps using the wall switch on the right. Proceed through the door at the end to Pumping Station 2.

(More detail needed - enemies encountered)

Down the Secret Pipe
To complete the exploration of the level, you will have to find the secret that allows you to jump into a broken pipe. You will drop into a horizontal section of pipe partly filled with water. Follow this around a corner into a partly flooded room. Take out the two Technicians in there and cross to some steps which take you to an elevator platform. This takes you up to a walkway where you can collect an Adrenaline and drop down into a second water-filled pipe. Follow this around two turns to a pool in an outdoor area. Climb out of the water towards the platform with a door at one side. Some Flyers will appear over the building on the opposite side from the door. When they are gone, go through the door to meet a Gladiator and a Guard (but, see Secrets, below, before leaving the outdoor area). Follow the passage around two corners to a door. On the other side of this, you will find yourself on the landing over the ambush room from which you were attacked by Gunners. They will, of course, still be there if you neglected to kill them earlier. You can't backtrack, so you have to drop down to continue, but, before you do, explore the landing around to the right in case there's something of interest back there. Crouch and find a sloping section of wall to jump towards to reduce fall damage. Go back up to the room with the broken pipe.

Secrets
This level has three (3) secrets:
 * 1) In the room that follows the ambush, with floor-to-ceiling pipes at the rear, turn back towards the ambush room and shoot the flickering yellow light to the right of the opening.  You will receive the message "You have found a secret".  To the left of the opening, the large crate stacked on top of two others will explode to reveal an Adrenaline.  Climb up to it using the exploding crates (unless, of course, you happen to have exploded them).
 * 2) Also in the room that follows the ambush, shoot the pipe closest to the stacked crates of different sizes to receive the message "You have found a secret area".  Climb on the crates and jump into the pipe to explore an otherwise inaccessible part of the level (see Down the Secret Pipe, above).
 * 3) Having broken open the secret pipe and dropped down inside it to explore, when you come to the outdoor area shoot the two gratings, one in the pool of water and the other high above it.  You will receive the message "You have found a secret" and a hatch will tilt up to reveal a cubbyhole with a Quad Damage inside.