File:Quake1.gif Slipgates in Quake are devices built by the humans of Earth before they were stolen and used by Quake as a way of teleporting onto Earth. They were made to transport humans and cargo from one place to another instantaneously. As they were possessed by Shub-Niggurath to transport her spawn of daemonic aliens from the other dimension's, the gateway was still open when Ranger went through. Other than their creators, they are exactly the same as a Teleporter for lore purposes, but work differently in terms of mechanics.