Analysis: China's nuclear arsenal could be vastly bigger than thought

The students’ professor, Phillip Karber, 65, spent the Cold War as a top strategist reporting directly to the secretary of defence and the chairman of the Joint Chiefs of Staff, the Post said.

Karber said that – based on the study of the tunnels – China could have up to 3,000 nuclear warheads, far higher than the current estimates, which range from 80 to 400, according to the Post.