Gehn's Laboratory
To get to Gehn's Laboratory, you must first go through the drainpipe after solving the Boiler Puzzle. Go through the dark drainpipe until you come to the end. Then click down and follow the path to the left along the rocks to a railed platform. There is a hatch on the floor of the platform you can open to gain access to and from this area from below.
 |  | | Pull this lever (in the lower right of the screen) to turn off the fans of the ventilation system. |
Go through the double doors, then turn around and close them. This reveals hidden passages to the left and right of the doors. Follow the right-hand passage (facing the doors from the inside) to a lever along the right rail of the catwalk and pull it (the lever is before you get to the locked double doors ahead leading into the lab).
This turns off the ventilation fans inside above the frog-catching device. (If you continue along this walkway, you'll end up at another entrance into the Great Golden Dome. You can go there now or wait until after you get into Gehn's Laboratory.)
Turn around and go back to the double doors and turn left. Follow the steps down to the frog-catching chamber. With the fans off, you can click on the grating above the frog trap to open the shaft and crawl inside. Follow the ventilator shaft until you come to another opening. Click on the grate and drop into Gehn's Lab.
Read Gehn's journal that's sitting on the table. Make note of the six symbols on page nine (like the ones on the Fire Marble Domes) and the five-figure D'ni numeric code on page 13 (the code for getting to the linking books inside each Fire Marble Dome). Then, go to the back door (not the one with the blue-lit button in front of it), go outside, and take the tram to Plateau Island, or go to the other doors, go outside, and to the right to go to the Great Golden Dome to prepare some more for later. If the tram is not there, go back into the lab and hit the blue-lit button next to the other doors inside.
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