Shakespeare Cliff - Descending on the Quad Bike (part 2)

Lost Artifact screenshot
Ride down into the wide tunnel, making a U-turn to the right at the bottom.

Lost Artifact screenshot
You'll hear some dramatic music and see a sniper run past the fenced opening here.

Lost Artifact screenshot
Dismount and walk out onto the long ledge jutting out over the pit to get a small medi pack.

Lost Artifact screenshot
Get back on the bike, race forward along that jutting ledge...

Lost Artifact screenshot
...and jump the bike across the pit onto the ledge in the far right corner.

Lost Artifact screenshot
Turn left and drive carefully along the rocky shelf at the edge of the pit.

Lost Artifact screenshot
Dismount behind the second support pillar and shoot 2 snipers...

Lost Artifact screenshot
...one on a ledge above the left rim of the pit...

Lost Artifact screenshot
...the other in the doorway ahead. (The second sniper is the same one you saw running around when you drove down through the tunnel. If you can't get a clear shot at him from this distance, just continue on. You'll reach him in a moment.)

Lost Artifact screenshot
There's a keycard sitting on a ledge below, but don't drop down there yet.

Lost Artifact screenshot
Instead pick up some flares on the ground near the support pillar.

Lost Artifact screenshot
Then get back on the bike and drive along the sloped, brown rim of the pit to the doorway in the corner where the second sniper was. If you didn't shoot him, you can run him over with the bike or dismount and kill him.

Lost Artifact screenshot
Inside this cavelike room, pick up the MP5 clips sitting on one of the stairs.

Lost Artifact screenshot
Then roll, draw pistols, and kill the 2 rats that try to sneak up behind you.

[Part 1 | Part 3 | Return to the Shakespeare Cliff Walkthrough]