Fangshan National Defense Fortifications

Military sites are concrete structures poured as a whole. Some of the entrances are door-style, with[...]

Military sites are concrete structures poured as a whole. Some of the entrances are door-style, with topsoil for planting vegetation and gates and outer walls painted with pine trees. Inside, they are spacious, reaching heights of two to three meters.
Others are designed as vertical shafts, offering more concealment with steps on both sides for access. The underground fortifications are interconnected by tunnels, extending to unfathomable depths.

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