Minecraft wiki entry for Things_to_do_when_bored, associated text: Install a computer mod (ComputerCraft mod), create "mining turtles" or "advanced" mining turtles, use the built-in mining program (tunnel length). Turtles need fuel, if it can't move, fill in the inventory with coal or other kinds of fuel, type in "refill all" to supplement the fuel. This will make you more secure because they're diamond pickaxes with infinite durability, can instantly dig, and are not afraid of lava or monsters. However, it can't be equipped with an enchanted pickaxe.