These excavators are built to work nonstop as they dig into the ground and remove material to a new location. You might have seen one while seeing road construction. Continuous excavators are used to tear up asphalt roads and the debris is sent to a truck by a conveyer belt. They are also used in gravel pits to penetrate the material and use a rotor to pull the material to the surface.
Continuous excavator videos
https://www.youtube.com/watch?v=RpVqgvLExIU