Episode 6

Justin's in for a bumpy ride as he investigates gigantic potholes in Louisiana, which win the prize for being the worst in America. He also gets a sneak preview of London's vast Crossrail project, and learns how engineers are attempting to rescue a giant tunnel boring machine which is stuck 20 meters below the streets of Seattle. Meanwhile, Italian reporter Fanuel Morelli visits a village that’s cracked and buckled after engineers tunneled though the mountain below. Also, Australian reporter Danni Marwick sees, first hand, the massive mudholes along the Melbourne-Sydney rail line that cause trains to bounce up and down, and even risk derailment.