Throw the lever to the left to lower the sub into the water.

Go back the way you came, around the lake, past the gate to the Fire Marble Dome, and up and out past the clear-cut trees. Cross the rope bridge, go back down past the beach and Sunner Rock (where the Sunner creatures were lying before), and follow the paths and ladders past the dry pool and down to the last ladder, which now gives you access to the lowered submarine.

Use the turning handle at the center to turn the sub around. Then, use the lever on the right to move the sub forward. When it stops, move it forward one more time. Next, climb out of the sub, turn around and climb the ladder. When you get to the top, flip the three down levers to the up position. This will extend all the ladders around the lake. Go back to the sub.

Turn the sub around and move it forward. At the first switching station, move the sliding lever to the left. This makes the sub follow the left track. Make the sub move forward once more to go to the school. Inside the school, play the hangman game on the left. Pull the ring on the right of the base to spin it around to the left. Count the number of times (clicks) the little figurine lowers. Matching this number with the symbol that appears in the little window in the base gives you insight into the D'ni number system by showing you numbers one through ten.

Go back to the sub, turn it around, and move forward twice. This will bring you to the Wahrk Gallows.