You begin the level in a rough-hewn, greenish tunnel. Follow it to an opening in the floor. Drop down onto a wooden beam and from there to the floor.
Approach the tunnel opening for a panoramic cut scene.
That trapdoor at the bottom of the very tall room is where you're headed.
Hang from the edge, climb down the textured rock wall...
...and drop onto the small, green ledge below.
Keep walk mode activated as you turn to face out over the room and draw the K5 Impactor. Walk prevents Lara from stepping off the edge, which helps compensate a little bit for the wonky controls when she has a weapon drawn. Shock the pesky bat (1) that flies toward you.
If you also tased one of the rats in the LOUVRE STORM DRAINS, you'll unlock the "Electrocuties" achievement/trophy here.
NOTE: In this level, only a few of the bats actually bother Lara. Most are just there to provide atmosphere. Lara won't target the decorative bats, so don't waste ammo shooting at them. Definitely kill the "real" bats, though, since bat bites will poison Lara, requiring you to use an antidote or large health pack.
Quick-save because the next jump is glitchy. Walk to the right edge of the ledge and take a standing jump onto wooden beam. Or, jump forward, grab the beam, and pull up. Harmless bats fly out of the tunnel ahead. (These are barely noticeable in the remaster, but I flag them for the chiroptophobic.)
Jump into the tunnel...
...and follow it to a hole in the floor. Drop down several ledges...
...to a small room that opens onto a broken bridge.
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