The Mineshaft is a Watch floor that is supposedly an abandoned mine. Due to the fact that the mine is darkened, it is difficult to see it well, but if you look closely, it contains the corpses of all the game developers except Milo. After about 5 seconds, the light in the elevator will turn off completely, and after another 5 seconds it will turn on again, but Milo will appear in the shaft. The lights will turn off again several times, and Milo will approach the elevator. When Milo gets very close, the light will turn off for 10 seconds, but when it turns on, Milo will appear next to the elevator with a creepy smile and a bloody knife and kill everyone who was standing next to the elevator exit. After that, the lights will turn off again and the elevator door will close. This floor was created for Halloween renovation, but it was decided to make it a permanent floor.
Fun Fact: You can temporarily roam around the floor. The lore from The Truth floor plays along with this floor in particular.