Walk forward. The lights come on and you'll find some Uzi ammo (1) on the floor. (This will be the UZIS themselves if you don't already have them.)
In the room ahead are 6 incubators ready to hatch some nasty Atlantean mutants. Step forward cautiously and the first egg on the left will hatch, releasing a projectile-hurling mutant (1). (It seems to be random whether each mutant uses darts or fireballs. Occasionally, if they survive long enough, they'll change attacks.)
Backflip several times into the doorway while firing.
If the mutant runs off, run forward and keep shooting until it explodes.
Regarding the incubators, you'll encounter a number of these throughout Atlantis. You can tell when an incubator is ready to hatch a live mutant because the mechanical arms that support each yellow "egg" begin to move. If the arms aren't moving, it's usually safe to approach. To hatch the next mutant (2), advance forward and to the right. When Lara passes the line in the screenshot, the first egg on that side of the room will hatch.
To minimize the damage, you can backflip a few times to get a little distance between Lara and the creature. Then jump from side to side while shooting to avoid its projectiles.
After the second mutant explodes, go down the right or center to the opposite end of the long room. As you approach the slightly raised area in the center pathway, the third egg on the left explodes and a third mutant (3) emerges.
Again, jump backward then use those side flips to avoid its projectiles, and kill the mutant.
Continue forward to find some Uzi ammo (2) on the floor near the middle of the south wall. Here at the back of the room are 3 doors: one on each side and another in the center. The door on the left opens as you approach. Enter and go up the stairs.
The see-through floor is safe to walk on, but there are gaps where Lara can fall through, so stay alert. Pick up a small medi pack (3) in the far left (southwest) corner. The door a little to the right of the health pack leads back downstairs, but it doesn't open yet. Advance along the right (east) side of the room. When you near the middle, turn left and approach the shotgun shells (4).
The egg below will hatch. Hop back and kill the flying mutant (4) from above if possible. (Note that the third incubator on the west side is now active as well. So avoid that corner of the room, or you'll have another mutant on your hands.)
If the flying mutant starts launching fireballs or darts, back away from the edge and try to take cover.
If it flies up above floor level, try not to let it land. Back away if possible and/or jump from side to side to dodge its projectiles, taking care not to fall through the openings in the floor. Don't let it back Lara into a corner. Assuming you're not attempting a pistols-only run, this would be a fine time to break out those Uzis.
DARK MODE: Even with brightness adjusted, dark images on a light background can be hard to see. May I suggest a reputable dark mode browser extension, such as Dark Reader? (Download only from trusted sites, like darkreader.org or your browser's web store.)
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