I made a new minecraft world with the seed: -1697157996
You should spawn on a small island with trees with another completely treeless island beside your one made up mostly of sand.
(You should use creative, I used survival but it would be easier for you to find what I am talking about). Fly over to the other island made up of sand and dig down until you find a really complex maze of caves and you should hear what I mean. I was just walking around the caves in survival (normal difficulty) when I started hearing these strange sounds that sounded like someone dragging something over stone (it is not one of the ambient sounds) and I got really scared. The sound repeated itself every like 5 seconds and then I heard this extremely weird giggle, like a demented Elmo. (I later found out that that was a witch, but I got so scared because of that other sound). Please find out what that strange sound is because I'm not joining back into that world until someone does.