The Mech
"Everyone ready?"
The digger engaged once the team finished all their checks. The cylindrical digger machine rotated its screw blades and dug right into the soil. With the speed and noise it emanated, the everyone in the area could guess what was going on from the rumbling alone. This was never about stealth. It was all about shock and awe.
"Seven minutes until we hit the tunnels!"
"Keep an eye on the entrance, report if you see anything suspicious, and I do mean anything!"
The foreigner must have known what was going on, but he prudently stayed in the depths. If he unwisely chose to expose himself, he'd be easily mobbed by Caruthers and his crew.