After using the 4 Shaft Keys to activate the blue light and re-opening the gate down below, return down the ramps to the gate, but don't go through. Instead turn around...

...and follow the hallway between the ramps...

...and past the sliding blocks to the ROOM WITH THE MARBLE BASIN. (Check the main walkthrough if you need help getting through.)

Now the east (right) alcove is open.

Go in and pick up a large medipack on the floor to the right.

Then use the switch on the left...

...to open another gate down near the SHAFT OF BLUE LIGHT.

Exit past the sliding blocks...

...then continue through the gate and down to the MAIN TUNNEL.

Here you'll encounter 2 more blue-robed baddies, one on each side of the doorway as you re-enter the MAIN TUNNEL. The one on the left drops a small medipack when he dies.

NOTE: If you don't care about getting every kill and pick-up, you can skip to the next page now.

If you want all kills and pick-ups, head up the slope toward the entrance.

Take a running jump along the right side of the pit to grab the opposite edge.

Pull up and continue up the slope to confront an assassin who enters from outside. Wait for him come halfway down the slope before killing him, or you may be unable to pick up the large medipack he drops. (The first time I killed him, he fell near the entrance, so I couldn't get close enough to pick up the medipack without triggering the level transition.)

Turn around and take a standing or running jump back across the pit from the right side to the left.

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