The grave digging machine (digger) is a fully automatic, mostly automated, steam-driven, rat-powered grave digging machine.
It was an invention built by the Gravedigger in Ooga Booga. It had two sets of digging claws that could dig graves faster than a shovel. Its power source, Iggy the rat, was stolen by the Ghoul Kids and the machine wouldn't work without him. After Rosella retrieved the rat, the Gravedigger fired up the machine and got digging again.