A mining operation unleashes the Sealed Evil in a Can. The Trope Namer is of course The Lord of the Rings, and it seems this happens a lot with little variation because Our Dwarves Are All the Same. A mine filled with evil is one of the great traditional Dungeons. Also, evil from mines have so many themes. You've got Greed and it can be a Green Aesop too! See also King in the Mountain -- accidentally finding him before the country's hour of need can be dangerous. Can result in an Abandoned Mine. Examples of Dug Too Deep include: