Dwarven Drills are devices created by the dwarves to mine bedrock. They are usually made of iron, with an obsidian drill. Many can be found in The Deepcore, where the abandoned bedrock mine is.
Dwarven Drills are thought to be powered by coal, which they burn for power.
The design of a Dwarven Drill can be comparable to the design of the tank (Panther MKIII) found nearby C.H.L.O.E., having an almost identical body structure.