Back at the JUNCTION, use the CROWBAR to open the padlocked door at the end of the walkway near the wall on the middle level.

Inside you'll find a LEAD ACID BATTERY, which you will need later.

If you want all the secrets, exit the battery room and follow the catwalk forward then left up the ramp to the UPPER LEVEL.

Turn left again and head for the CONTROL ROOM, taking care not to fall through the gaps between the walkways. (If you don't care about getting all the kills, don't go inside and instead just skip to the next 2 screenshots.)

Press the button in the doorway to turn on the lights if you like. Enter and run to the left.

Roll and take out the mutant lurking on the other side of the doorway before it can blast Lara with his toxic breath.

If you look out the rightmost window of the CONTROL ROOM, you'll see a small opening in the ice wall. That's where you're headed next.

Go back outside and climb onto the roof above the doorway.

Cross to the back right corner.

Turn around and crawl back off the edge but don't let go. As you do this, you'll hear a mutant down below begin to growl, assuming you didn't kill it earlier. Don't worry; it can't get you up here.

Traverse to the right...

...until Lara pulls her feet up onto a ladder on the back of the building.

Climb down until Lara's feet are at the lower edge of the building. (Here it may help to climb down as far as possible so Lara is hanging by her hands. Then tap the Forward button twice so her feet come up onto the bottom rung.)

Then jump/twist and grab the edge of the crawlspace behind you (i.e., hold Action + Roll then briefly press Jump to spring off the wall, twist in mid-air, and grab).

Pull up and crawl in to get SECRET #1—a small medi pack and grenades.

[Part 2 | Return to the RX-Tech Mines Walkthrough]