An unconventional project by US university students has concluded that China's nuclear arsenal could be many times larger than current estimates, drawing the attention of Pentagon analysts. The Washington Post reported on Tuesday that Georgetown University students under the instruction of a former Pentagon official have assembled the largest body of public knowledge yet about a vast network of secret tunnels dug by China's secretive Second Artillery Corps, responsible for nuclear warheads. The 363-page study has not yet been published, but has already sparked a congressional hearing and been circulated among top US defence officials, including the Air Force vice...