Under my house, there's a huge and long water tunnel that goes through the whole town, me and my friends decided to explore it, at the entrance everything was dirty and nasty, some walls have been painted with 666 and Satan signs (tbh that was creepy af because I was told that someone was sacrificed there for the Satan).
We went deep into the tunnel and saw lots of bugs and many bats surrounding the tunnel.
As a kid I remember I heard weird sounds coming from the tunnel, I heard screams and laughs but couldn't really know what really happened there.
Me and the boys brought some flashlights, we passed under pipelines (could be gas). Tbh I had the balls to continue into the tunnel but some weren't really into this so we went back home :(