Dog Keeps Staring At Drain, Then Airport Staff Finds Out Why

Ventilation shaft

It was an easy route to follow, and everyone in the room saw where water exited the north wall of the building. But when he pointed out that the tube was extremely narrow, not wide enough for even a rabbit to crawl through, he pointed to the ventilation shaft that ran parallel beside it. “It’s more likely that the sound came from there. But where does it go?”