Besiege v 0.27 - The Tunnel Driller. Works, no mods. 

Thanks again MatzeGamer!
Don't go full throttle all the time, the tracks will break or you'll get stuck.
Push in the drill a bit, let it do it's job, go both directions with the drill, repeat.
Don't turn to tight with it, it's long, slim and heavy.
bsg: www.besiegedown...
Raise: Semicolon
Steer: I,K,O,L
Drill: AltGr, R-Ctrl
Most of my other stuff: www.besiegedown...
Music:
Easy Jam by Kevin MacLeod is licensed under a Creative Commons Attribution license (creativecommon...)
Source: incompetech.com...
Artist: incompetech.co