Stretching 22 kilometers, this engineering marvel will officially begin operations next year.

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China has completed the construction of the world's longest express tunnel through the Tianshan Mountains, according to a local news source. The Tianshan Shengli Tunnel is just over 22 kilometers ...

A drone helped Mexican state police find a tunnel that went underneath the border wall in San Luis. The tunnel was secured and closed in a joint operation between the Secretariat of Public ...