How do you build the world's longest expressway tunnel?

How do you build the world's longest expressway tunnel?

For the 22.13-kilometer Tianshan Shengli Tunnel in Xinjiang, giant machines burrowed through solid rock, excavating and reinforcing as they advanced, so the grass, trees and ridgelines above could remain undisturbed. Here in the Tianshan Mountains, time is folded: an hours-long drive on winding mountain roads becomes a 20-minute passage through the mountain. Because on the other side, someone is waiting.