What was down in the hole. Where did it lead? What did you do down there? Spooky!

Very cool picture but total creepage!
What could it lead to?

I have that exact desk in my home. My husband got it from an antique dealer around 25 years ago. I wonder if it was Al's? It was in great condition but I used some Formbys stuff on it to recondition it. It is pretty awesome like the picture here.