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China's third-tier construction hinterland was still a wild and isolated land. Thousands of construction troops had to build the Chengdu-Kunming Railway on cliffs with few human traces. The army loved the people and supported the army, and the army and the people were united as one, creating a cultural phenomenon of that special era. In just a few years, the original riverside villages transformed into the ideas of the Great Industrial Revolution, thus giving the third-line construction a good mass foundation. The aboriginal residents have a close friendship with the soldiers and civilians of the railway corps. The soldiers and civilians built the Chengdu-Kunming Railway with their lives and blood.

The mysterious third-line construction began in the rarely visited Jinsha Rift Valley. The construction army went deep into the ravines and wild ridges and encountered logistical supply difficulties. A Jinsha tributary was the only passage, and earthen wooden plank boats in the deep ravines were requisitioned. For the mysterious third-line construction, the boatmen risked their lives and finally completed the transportation of military supplies.