After deactivating the lasers and climbing into the duct above the Mona Lisa, as shown in the previous section, crawl forward to a T intersection and turn right.
A bit farther on, the passage widens and Lara can stand. Continue forward, then around the corner to the right...
...to an intersection with a broken grating on the floor. Crawl through the duct ahead. (The passage to the left is a dead end.)
You emerge in a small room with with a fan overhead and a yellow ladder. Climb the ladder...
...but wait before kicking down the metal grate at the top. There's a guard (10) out on the roof. If you want to remain stealthy, watch him through the grate and wait for him to head off to the left. (He'll tend to move right first, then about-face and head to the left, then away from the grate.)
Give him a few seconds to move off, then kick down the grate...
...move out, and tase him before he notices Lara.
Face the duct opening, head to the left, and climb onto the air conditioner, then the curved metal duct above it.
Turn to face the wall and jump straight up to grab the ledge. Traverse to the right, past the fan-shaped wrought iron decoration, and pull up.
Walk along the ledge to the next bit of decorative ironwork.
Hang and traverse past it. Pull up again and keep going.
When you reach the overhead cable, you can either jump up to grab it or hang from the ledge once more, traverse around the corner to the right, and pull up onto the protruding bit of ledge.
If you grab the cable from here, you'll have a little more time as you climb hand over hand to the next building.
When you reach the other side, you'll get an upper-body strength upgrade.
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