Deep Spiral Digger

This digger can dig to the bottom of a map and continue mining from the lowest layer. It is the only driller that can get to an oil resource. So for mining oil you`ll first need to dig with the deep digger before building a Pump Jack on top of the hole.

The digger can dig infinitely so a good indicator that you hit the bottom and can swap digger with the Pump jack is when you dig out Uranium.