The Guoliang Tunnel, located in the Taihang Mountains of Huixian, China, is a remarkable feat of engineering carved by local villagers. This tunnel, which is about 1.2 kilometers (0.75 miles) long, 5 meters (16 feet) tall, and 4 meters (13 feet) wide, was chiseled through solid rock over five years starting in 1972. The villagers, led by their head, Shen Mingxin, undertook this challenging project to create a safer and more accessible route to their remote village, which was previously only reachable by a perilous path with precarious steps.
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