I don’t have any info on this setup, but it appears the hole can be covered and used as floor, or opened and used as a table. Seems like a stretch for this to be easily accessible, clean and useable, but I wanted to feature it out of pure...
This coffee table from Spy Emporium has a secret compartment revealed when the lift-up top is raised. The top stays level so there is no need to remove items from the table before accessing the secret compartment.
