You have to descend into the underground through the Hot Hatch. You will need the old vine from the roof of the Storeroom (far left past the living quarters), and the Robot Crab, and Sprocket the robot (inside Sully's Paraphernalia).
Have Sprocket drop the crab on the hatch to cool it down, then enter the tunnels. When attacked by the monster plant, use the old vine to pull down a steam pipe on it. Solve the three puzzles at the bottom left to restore power to the elevator.
(see related question)
You find the pie.
First, you fix it. Then you jump on it.
its in the museum on mainstreet of steamworks island :)
It's Steamworks Island #14th Island
(The solution is at the related question "How do you beat Steamworks Island")
Take it to the vine spot and click space bar to cut the vines. (it is to the left)
the crab on steamworks island is next to the living quarters
You go to Steamworks and head to the museum and there is the Deogen
in the elevator there is a secret room with a skeleton that is where it is
steamworks island
There is a video walkthrough at the related link below. There are written WikiAnswers solutions at the related questions, as there are for all Poptropica islands. (How do you beat Steamworks Island) (What is the walkthrough for Steamworks Island)
i dont know but ive got the steam battery multi tool and dirty beaker