816 Underground Nuclear Plant
This top secret Chinese military megaproject is the world’s largest human-made tunnel structure, built during the Cold War.

📜 Unfinished Chinese underground nuclear weapons production facility, declassified in 2002, located in Fuling, Chongqing.
🔍 World's largest man-made tunnel structure, featuring the world's largest artificial cave, 20 stories high, with 21 kilometers of tunnels.

Why Go

🚶 Explore a vast underground labyrinth with 20km of tunnels by golf cart.
💡 See the reactor room with neon-colored tubes and communist slogans.
🗺️ Experience a unique historical site from the Cold War era and learn about a significant site from Chinese Communist Party history.
🚶 Open to foreign tourists since 2010.

Why Avoid

🗣️ Tours are only offered in Chinese.
🚌 Bus can be crowded, limited seating.
⏳ Tour takes up to 2-3 hours, follow guide to avoid getting lost.

Tips

🚗 Consider hiring a driver for convenience.
🗓️ Expect fewer crowds outside Chinese holidays.

Cost

💰 70 yuan (as of 2019), includes golf cart ride and tour guide.

Hours

🕒 Tour takes a maximum of two hours.

Last updated 1 day ago

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