Welcome, friend! You've stumbled upon the secret entrance of the Underground Bunker, where the air is thick with paranoia and the snacks are always stocked.
A: Because the world above is just so... boring.
A: Ah, but you'd be surprised at the secret squirrel nesting area we've set up in here.
Or, if you're feeling particularly adventurous, you can try to escape the bunker. We dare you.
But don't say we didn't warn you...