Thanks once again, Bobby Joe. Excellent work! Did you see any indications of what type of work might be going on? Definitely looks like they've been running vehicles in and out of the Sinker, maybe the ones purchased at the recent mining show that Ouri (I think) posted pictures of not too long ago. They're probably stored inside the Sinker, along with the drills ;-). That pipe coming out of the Sinker is too high to be a drainage pipe, and probably too small to be ventilation. Maybe an airline for hydraulic tools?