In the wee hours of the night, there is an extremely small chance you'll find both Copper and Booker asleep at their posts. Upon talking to them, they'll mumble about some unusual Gyroid-looking animal. If you listen to each mumble on a couple times, suddenly the door will crack open behind them. It's possible to enter the door at this point, and you'll find the path covered in a dark powder. Following a loading screen, assuming your console doesn't crash at this point, you'll enter into a town similar to yours, but there are no animals. There is no beach, and you are surrounded by mountains. While every space of ground is covered in cracks hinting something is buried, your inventory was lost somewhere between here and home. In some of the corners belong caves that when looked upon seem like black holes. All of them have gates in front of them. There are a few houses on the surface. You can try going into the houses, but all of them are seemingly locked. There are no accounts of any interactions with other animals, but it's clear something lives here.