ive heard distant rebel noises(begginning of talking,footsteps)faintly in the distance it fits considering the rebels in this got masscred by the combine so it might be a bunch of the souls wandering around but im still scared (sorry if necro)

"Something similar happened to me too.

I was testing out a new Nodegraph i made for the map since the current one isnt all that good.

To test it i spawned NPC rebel's in parts of the map, tested if they used the nodegraph correctly, despawned them and repeat.
When i spawned them in the small 2 office boxes with the ticket booth windows in them, something weird happened.
I use the Holographic Hud thing which has the radar and on the radar a dot suddenly showed up, i didnt spawn it it just was there- and moving.
On the recording i could see that it was a Civilian npc holding a camera. It followed me but before it reached me i noclipped out of bounds. After that it was gone. I tried to replicate this but i cant get any results." that might explain my hearings of the rebel noises

While exploring the map, I came to an area where there was a door and as soon as I saw it, it closed out of nowhere. I tried to open it but it wouldn't work, and all this while I thought I heard breathing and moans in the game.