다음 채널에서 시청 가능: Pluto TV
시즌 1, 에피소드 1: Take a trip underground and get up close and personal with titans of tunneling: the biggest, baddest tunnel boring machines on the planet. These monsters dig deeper and faster than ever before, gouging holes in the Earth's crust for subways and sewers.
Documentary · 2012년 4월 26일 · 43분