China may be using thousands of miles of underground tunnels to hide a nuclear missile arsenal that is far bigger than current estimates, according to researchers.

They spent three years translating secret military documents, scouring the internet and studying satellite images for clues – and concluded that China may have as many as 3,000 missiles, compared with general estimates of between 80 and 400.

The researchers at Georgetown University, led by a former senior Pentagon official, concentrated on a 3,000-mile network of tunnels dug largely in Sichuan province by the Chinese Second Artillery, a secretive unit responsible for protecting the country’s nuclear weapons.

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