Teleporter A

Teleporter A is in the lobby. Once you pass the cameras, go through all the left doors and you will be met with a teleporter.

BEFORE FINAL UPDATE: If you go into the teleporter, you would lose a leg and a hand and get teleported back to the tree room.

AFTER FINAL UPDATE: If you go into the teleporter, you would be teleported to Exit B3 and once you go far enough to try to go to the door, you will be teleported to the Radio Room. Find more information on what to do after here: