Giant geotechnical drilling rig on treads.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...k_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...drill_tank.jpg
Previously:
https://www.homemadetools.net/forum/...804#post129173
https://www.homemadetools.net/forum/...023#post125421
https://www.homemadetools.net/forum/...035#post112231
https://www.homemadetools.net/forum/...534#post110853
https://www.homemadetools.net/forum/...482#post110702
https://www.homemadetools.net/forum/...7862#post86386
https://www.homemadetools.net/forum/...1250#post74040
https://www.homemadetools.net/forum/...173#post138380
https://www.homemadetools.net/forum/...786#post136934