Re - Occuring Dream: Grandpas Secret Passage!

One dream that I have had for years is a re-occuring dream with my grandpa. The dream starts out with me in my grandparents basement, in the storage/freezer area, with me looking at my grandpa. He doesn't know I am there looking at him. He is moving things over the floor until the bare floor is showing. On the floor is a latch that is the colour of the floor, so it is very hard to see. He opens it and I look into it and fall down into it. It is kinda like a Alice in wonderland when she falls down the rabbit hole or in Harry Potter chamber of secrets type thing. It is dark, with sponge walls, no windows and a trampoline for the floor I look around at the room and then the dream ends.

The dreams details sometimes change, like there are children and some of my friends in the room. Sometimes my grandpa isn't there or he comes down with me. Sometimes I stay down there longer, I have even got as far as going to a door that leads into another room but I have never made it far enough to open it.

I'm not sure if the dream means something or not. I first thought it means my grandparents have a secret passage and I checked their basement many times, but alas nothing. Every time I have this dream I want to check agian their basement agian because it is so realistic.

This dream is my only re-occuring dream I have ever had, and I have it about once a couple of months. I don't think I have it when I am feeling any certain emotion, but it sure is a weird dream.