To activate the teleport arches, Alundra must first meet with Berue. This can be achieved by first obtaining the Sluice Key from the northernmost cave of the Despair Desert, and entering the chamber to the south of the waterway in the northern half of the desert. There, both switches must be thrown at once for the sluice gate to open, draining the water and allowing Alundra to enter the chamber beneath the water.