hidden device?
A secret access point to something?
Or simply a detail we had overlooked for years?
With each theory, the story became more fantastical.
The surprisingly simple solution
After all the speculation and excitement, it turned out the answer was much simpler than we had thought.
It is, quite simply, a ventilation or drain pipe—part of the house’s plumbing or drainage system.
The small red part inside is likely a flap or a plastic guard designed to prevent dirt, insects, or small animals
It sounded hollow.
