How do you make silent teleporter rooms like in map16 (The Haunted Mansion) of The Civvie 11 Massacre

[CursedJade999]

I am using Doom Builder's ZDoom (Doom in UDMF format), and I'm making a map that needs one floor on top of another, so I thought a silent teleporter contraption would do the trick. In map16 of The Civvie 11 Massacre, there is an endless hallway with rooms that aren't connected, and I have tried and failed to find how it is done. If anyone knows how to pull this off I would be very grateful if you told me how.

[Stabbey]

In UDMF, Action 71 is Teleport (silent).