As the tunnel-boring machine cuts through Croton's upper tunnel, morale is at an all time low. Temporary Foreman Anthony Aviles' aggressive leadership style has forced Walking Boss Morgan Curran to monitor the situation closely and he's beginning to fear for the worst. Meanwhile at the #7 Subway line extension in Manhattan, Walking Boss Martin Hostetter and Foreman Ryan McGinty work to perfect their blasts as they move deeper and deeper beneath the city streets. Back at Croton, Morgan moves to the lower tunnel where he and Forman Repete Moore prepare to blast out a section of "tights" -- outcroppings of rock that must be eliminated for work to continue. Just as Morgan is about to set off the blast, the situation with Anthony in the upper tunnel worsens. Distracted from the task at hand, Morgan takes decisive action to keep the Sandhogs on track.