Quake II/Lower Palace

Level objective
The objective for this level is to find the Data Communications Laser CD in the Upper Palace.

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Secrets
This level has six (6) secrets:
 * 1) If you come into the Lower Palace through the "main" entrance from the Outer Courts, you will quickly arrive at a "T" intersection where there is a tall pillar of translucent material with a Quad Damage on top.  To lower the pillar and collect the Quad Damage, and the secret, shoot the face on the wall behind it, then turn 180 degrees and shoot the face high above where you came in.  If you get to the Lower Palace the "back" way, through the water, then you will come to this intersection from the side, so the faces are to the left and right.
 * 2) If you come into the Lower Palace through the "back" entrance from the Outer Courts (through the water) you will come up a ramp into a small room with a balcony above and behind you (from which strogg will attack you).  To the right of the balcony, as you look at it from below, there is a section of wall that can be broken by shooting it.  It may already be broken from the firefight with the strogg as there are exploding barrels there.  Go through the opening to find all manner of good stuff in several locations.  Note that there are strogg in there guarding the stuff.  Keep going until you collect an Invulnerability, then backtrack to come out of a hidden panel in the wall of the main corridors.  Because a) you may want to re-supply after fighting the strogg in this level and b) popping out of the hidden panel doesn't put you in the best position to fight the strogg there, you might consider leaving this secret for later on.
 * 3) On either side of the cathedral-like computer room, there are staircases.  One goes upwards and to a room from which you can take an elevator up to one of the exits to the Upper Palace.  In the elevator room, a staircase winds behind the elevator to the balcony of the computer room.  On the wall by this staircase is a diagram or computer screen.  Shoot it to open a secret passage.
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