I recently shared a story about one of my experiences working for the State of Kentucky in a juvenile offenders group home that was a former TB hospital. The first story was "Group Home Ghost." Actually, the building that housed the group home was actually one of the buildings that the doctors and nurses stayed in while they were working. I've been asked to share some more of my experiences there, so I have decided to share a couple more.
When I first started working at the group home as a youth worker, I had to work third shift two nights a week. Third shift only has one person working, so this makes things even worse for a new person. It didn't help that all of the other workers were of course telling me that the place was haunted and sharing some of their stories with me. Which these stories weren't too bad when I was working second shift with other workers.
The building I was working in was very old and was heated by an old boiler. There was a heavy fire door leading to the boiler room that was spring loaded and remained shut all of the time. Well, on one occasion in the middle of the night, I heard this boiler room door creak open and slam really hard. There was nothing else in the building that could make a sound like this.
After restarting my heart, I completed a security check to make sure all of the youth were in their rooms on the main floor where I was and that no one else was there. I then proceeded to slowly go down the stairs to the basement where the boiler room was. There was no one in the basement and the door was shut. I opened up the door and it made the exact sound that I heard while I was upstairs. I completed my security check and ensured that no one was in the building that shouldn't be there and headed back upstairs rather quickly.
I had finally calmed down when I heard the door open up and slam once again. There was definitely someone messing with me, but apparently it wasn't someone that was alive.
Not trying to rain on your parade, but I wonder if that sound may have been produced by the boiler itself? They can pop, hiss, bang, and knock, sometimes quite loudly, and, yes, they can even sound like a heavy door slamming shut. For some reason they seem to like making these noises mostly in winter or cold times. Top it off, you were on 3rd shift, so I imagine things were pretty darn quiet, which means sounds are amplified. Now, mind you, I'm not saying it WAS the boiler, just a possibility, and the assumption it was a working boiler.