The mod digs a 1x3 tunnel by adding torches and rail. It works as a hopper minecart with the digging functionality to it. It places rail and torch (in every 6 block). You can move the minecart by hand, by minecart with furnace or by using power rail and redstone torch. If the excavator detects any hazards (cliff, lava or water) it will stop digging and indicates the hazard.
For details please read the Readme on GitHub.
