There's a shorter way there than what Llevram suggests and all it requires is that you have found a set of wires lying around.In case you don't want to be thoroughly spoiled, I'll 'hide' the rest of my explanation. Highlight to see it: "If you have the wires, make your way to the stairs going up (if you go down the main hallway going away from the hubroom with all the doors, it's the only corridor leading to the left before the main corridor turns left and ends -- take that leftward corridor and it will end in the steps) and head up to Upper Marten's Bluff. You'll need to do some wandering but you'll find another set of stairs leading down shortly after having passed through a room with an unusual support pole in the center. Head down those steps and you'll find the teleporter. Use the wires to fix it and then push the button with the bridge on it and enter the t-port area. You'll be taken to the N. Wilderness and find yourself facing the bridge. Turn the opposite direction to enter the Umpani Base Camp. You'll have to walk back to Marten's Bluff using the reverse of Llevram's route but at least you've saved yourself time and effort in getting there."