Sophia's office has a fantastic view over the Thames - enjoy it for a couple of minutes as there's only trouble brewing outside. The fish tanks look an inviting target - but appear to be made out of bulletproof glass. When you get bored, head out of the office door.
The pyrotechnics that begin as Lara nears the end of the hallway mean Sophia is fully charged. The madwoman rains destruction down on the small landing. Head for the ramp. Pull up top and turn around. There's a monkey swing overhead and if you keep moving you should be OK.
Drop down at the end, go left, and then jump-grab and pull up above the monkey swing. Run along the walkway to a button on the far wall and press it. Roll as soon as you push the button, as Sophia zeroes in for the kill.
Hustle back along the walkway. A trapdoor has opened to the ledge above. Pull up to the ledge. Now you're almost on the same level as the boss. Run along the upper walkway toward the ladder. You can hide out near the base of the ladder and wait for the boss to recharge. Quickly climb up the ladder when the time is right. At the top of the ladder, crawl through the space on the right. Turn around and climb on top of the crawl space.
Off to the right, you can see an easy jump to the bad side of town, but don't make that leap just yet. Instead, run along the upper walkway. Jump and grab the distant ledge as the boss unloads to your right. Climb up and keep moving straight ahead. There's a fuse box on the wall.
Shoot the fuse box and Sophia gets an overload of power. You can see the last of the relics across the way, but the direct route is electrified. Now's the time to head back and collect the medikits and the level's only secret. Retrace your steps to the button in the wall a couple of levels below, picking up the goodies as you go.
Stand under the trapdoor opposite the button and then drop onto the small ledge on the dark side of the raised section. Turn around and drop off the ledge, grabbing the edge. Shimmy left and drop-grab to grab the edge of the crawl space. Go in and pick up Secret #1 - a rocket and a large medikit. Safety drop to the ground and climb back up to the highest ledge - in peace this time.
Make the easy jump across the street. It's on the other side of the crawl space roof. You have to pick your way carefully through the charged area. Climb the cement blocks and head leftwards, avoiding the metal walkways. Finally, climb over the box to the right of the artifact. Press the switch here to switch off the current and go for the artefact.
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