Journey to the puzzle

Climb back up the stairs from the Swap Machine that takes you to Farley's room. On the landing, there's a narrow set of stairs against the wall that will take you farther up.

Make your way across the landing there to the door on the far side. Through it, you will find another chain gondola terminal.

Ride the platform across to the other terminal next to where you turned the power back on.

Follow the catwalks around to the left to lower the stairs and create another shortcut. You don't need to use this right now, but it'll save time if you even need to come back this way.

At the end of the catwalk is an elevator. Take this down to your next puzzle.

The puzzle

You'll arrive in a round room with a Swap Machine in the middle. This Swap Machine also takes you back to Hunrath — on top of that globe device outside of the mayor's vault. The mechanism you'll use to solve this puzzle involves the drive motor beneath the globe. This will allow you to rotate the chunk of Kaptar before returning it. You can use this to access those doors you see high on the wall and a tunnel that you can't see at the moment.

Press the button four times and return to Kaptar. Go up the stairs and into the tunnel to unlock a door in the temple.

While you're here, it's a good time to take care of something that will come up shortly. Head forward and down the stairs. Turn to the left and head into the channel below the chains. Turn right and take the walkways back around to the front of the temple. Take the stairs up to where you engaged the power.

Go back to the turret you used to engage the power. Point it at the bottom left, and use the diagonal control to disengage that piston. Turn around and backtrack all the way to the globe Swap Machine.

Use the Swap Machine and travel back to Hunrath again. Head underneath and press the button two more times to rotate the sphere again. Stop when it looks like the image above.

Down the ramp behind you, you'll find a tunnel that leads to the Arai hive.

Before you travel too far down the tunnel, keep on eye on your right for a wooden fence section. This leads up to the other locked door above the globe room.

Return to the ramp, and make your way down. There will be a room on your left.

Inside there is a broken Swap Machine linked to a scale, a dead alien and a folding table and chair. Check out the papers on the table. The larger sheet is a detailed plan about the evacuation of Hunrath. The smaller sheet is a long string of numbers that will vary between playthroughs.

Punching this number into the machine by (now at the top of) the stairs near the turbine will get you the Sweet Revenge Steam Achievement.

From the Swap Machine/dead alien room, return to the ramp and keep heading down. This path will eventually lead to a new area of the temple floor. Follow the path up and around to the right.

You'll pass through a gear. If you haven't already disconnected the piston from the beginning of this guide, the gear will be spinning and block your passage. If you've been following along, you can pass right through.

Watering the Tree

On the other side of the gear, you'll come to the base of the Tree. Repeat the process from Hunrath to restore the Tree's water. Head down the tunnel and open the valve.

Nearby, you'll notice that the pathway out into space that leads to Hunrath is active now. This isn't useful at the moment, though, as there's still one more thing to do before leaving Kaptar.