How do I disable the T'rang teleporter? I'm aligned with the Umpani not the T'rang. I really don't want to since I use it frequently.

Your mission is to disable the teleport of youngers from the space ship, not to destroy the teleporter you use.

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The teleporter can be destroyed by changing the paramters at the nargisst monitor, located behind z'ant. The monitor won't accept your command unless you first flipped a switch somewhere (power station?).