We have a couple Brokk 180's at work for working inside the tunnel. Well, that was the idea, anyway, until they realized that the Brokks couldn't do nearly the amount of work they wanted. Working in this tunnel we are still allowed diesel engines, provided they are equipped with a scrubber as we are pushing a bunch of air through the tunnel with surface fans and a couple booster fans throughout. So in hindsight, the Brokks didn't work for this application. From what I heard, we are selling one of the units.
Go hard, go fast, or go home