Quake II/Upper Mines

Level objective
The objective for this level is to activate the mine machinery to gain access to the Drilling Area.

Immediately upon arriving you find yourself standing in toxic liquid, taking damage. The door opens, but the path ahead is barred. You can choose to take out the enemies beyond the bars now, or simply back up and let the door close. Notice that the door bears a red "EXIT" sign; it may be the way out of the Mines unit, but first you would need to find a way to retract the bars and make the passage across the toxic pool safe. Turn around and head to the door at the opposite end of the short tunnel segment to gain access to this level of the mine.

As soon as the second door opens, you can collect a Grenade Launcher.

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Secrets
This level has two (2) secrets:
 * 1) When you reach the ventilation systems control room, look to the left of the wall button for a cabinet that periodically emits sparks. Shoot it; it will take ten Blaster shots.  The cabinet will explode and you will receive the message "You have found a secret".  Where the cabinet stood there will be a Quad Damage.
 * 2) At the floor button that extends the bridge to an earlier part of the level, face the bridge and look to your right.  In the corner is a dark wall panel that slides up when shot.  It does not stand out in any way, so just fire your Blaster into the corner and move the aim point around until you hit it.  In the alcove behind the panel are two boxes of Bullets and a MedKit. You will receive the message "You have found a secret" when you enter to alcove to take them.