Inside the building beyond the excavation pits (shown in the previous section), there are 4 wooden crates. The one on the right contains Uzi clips. Shoot it to get the ammo.

Stand facing the side of the metal shelf and push it out of the way.

Crouch and shoot the grate blocking the crawlspace.

Crawl through.

Shoot another grate in the next opening and crawl out out until Lara can stand.

Immediately turn right and kill another enemy waiting in the corner to the right of the door.

Shoot the wooden crate on the left...

...and pick up a METAL BLADE.

There are 2 movable metal shelves in the southeast corner. Go around to the left side of the first shelf and pull it.

Go around to the right side and push it closer to the crawlspace.

Then pull the other shelf once to the left.

Now you can pick up a SECRET (63/70), the SHOTGUN (or ammo if you already have the weapon), in the corner where the second shelf was.

Grab some more shotgun shells on the floor to the right of the door. Push the button to open the door.

Immediately flip onto the ramp and get those weapons out.

There are 2 bad guys waiting outside.

[Sphinx Complex Walkthrough]