Quake II/Cooling Facility

Level objective
The objective for this level is to activate the cooling pump to lower the coolant around the reactor. To do this, you need to fight your way to the pump control room, turn a wheel valve and push a wall button. Having done this, there is more fighting before you are able to return to the reactor.

Strategy
Other than always being on the lookout for strogg with a suitable weapon in hand, there is no particular strategy needed to get through this level. The path that you need to take is clear, although you will be rewarded for exploring dark corners.

You enter the level through a large pipe, which opens into a courtyard. You cannot leave the level this way and you will return to the reactor via a different exit. After clearing the courtyard of strogg, drop down into it and explore the opening opposite. You will find a room with a channel of flowing water which enters from a pipe on the right. At the end of the level, you will be swept down this pipe into a strogg ambush, so take a look around and decide what you will do. For example, you could plan on hopping out of the water and hiding among the boxes on the far side of the channel.

As you return to the courtyard, note the grating that you walk over. At the end of the level, this will be open and you will drop down through it to find the exit back to the reactor. If you want to go through the level again (to complete the kills, find missing secrets, pick up items, etc.), walk carefully around the edge of the open grating to get back to the courtyard.

Back in the courtyard after this bit of preliminary exploration, there is a button to press that opens a large panel in the floor. Drop into this to continue. Good luck!

Secrets
This level has three (3) secrets, plus a bonus:
 * 1) After entering the flowing water (or walking along the edge of the channel that holds the water) you will first turn to the left and go down a slope.  As this slope begins, get out of the water on the left side and take the ladder down to a lower level.  Here you will find a hidden room with health and ammunition.
 * 2) From the first secret, the flowing water will eventually take you into a large flooded room with two elevators.  Take either of them up to the balcony.  Go around to the right until you are above the water channel and hop up onto the balcony wall on the inside.  Look towards the elevator that comes up directly at the exit door.  On its right, you will see a ledge part way down on which there is a mega-health.  Go forward and jump down onto this ledge.
 * 3) In the room in which you turn the wheel valve to achieve the level objective, there is a hidden room behind the wall diagonally opposite to the door by which you came in.  You may have opened up the wall in the battle against the strogg in the room; otherwise, shoot the wall to break it down.

In addition to the secrets, there are several places in this level where ammunition and health are placed out of sight and may be missed unless you search for them. For example, when you leave the large flooded room (see Secret 2, above) you will enter a small room with a pool of water on one side. Go into the pool, turn around and crouch to find grenades.

(Add content about the "bonus", anyone who knows what this might be.)