Bombendrill

Bombendrill is a robotic explosive created by Robotnik in an attempt to get rid of Slimantha. However, since explosives don't work against Slimantha, Bombendrill just blows up Sensits instead. He first buries himself underground, once it feels a change in pressure in the dirt around him (someone walking.) He will unlease a charge from the red container in it's torso. Due to the material Bombendrill is made of, it is not damaged by the explosion. It's auto-repair system fixes the red container for the next victim. Dr. Robotnik once tried to disable it remotely. However, despite the strong material it's made of, the part that allows it to be controlled remotely has been damaged, presumably by Slimantha.