Eventually, you'll reach another locked green door. Blast it and
enter a series
of winding hallways containing ceiling-mounted lasers.

Tip: The best way to get through corridors fraught with
lasers is to use a
weaving, zig-zag running pattern. The lasers will lazily target
you, but if
you're quick you can run through unscathed.

The passage will eventually dump into a large area crawling with
enemies. As
before, kill only the enemies in your way. You real goal here is
to find three
bunkers containing enemy generators. They are scattered through
this large
crater, so stay on the move. When you locate one, don't get down
in the bunker
with the baddies. Just stand at the top and strafe, popping until
the generator
is destroyed. There are plenty of guns sprinkled around the area,
so ammo is no
concern. Grab it when you need it.

When you've destroyed the third generator, a door will open at the
end of the
right branch of the canyon. Run through the winding hall and shoot
the lock door
to attain the next Checkpoint.
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