My brothers’ room had a hole in the floor. We would pass through the hole, down a ladder and into a tiny playroom. We had to climb or slide down to exit the room. At the bottom of the slide, a trampoline with brown material protected us from rusty springs.
My adult mind contemplates if this passageway was dangerous somehow. I suspect a home inspector would have marked the area in red. Four children were basically crawling through the ceiling.
Our hamster got stuck inside of a wall once, I wonder now if he had seen us disappear into the floor and wanted a similar adventure.