China has secretly built an underground nuclear submarine base in the South China Sea, posing a new threat to powers in the region — a development the Pentagon says it has known about for at least two years. Satellite photos of the base obtained by FOX News show a large harbor and massive tunnels that defense experts say could shelter many nuclear subs. The Defense Department has estimated that by 2010 China will have five operational 094-class nuclear submarines capable of carrying 12 nuclear missiles each, according to the Daily Telegraph. According to the Defense Department, China has 57 attack...
