Does North Korea have tunnels under Seoul?

Gen. Hahn Sung-Chu never believed North Korea could dig a tunnel that reached Seoul — until now.

Standing inside a basement of an apartment block in the heart of the capital, the former two-star general in the South Korean military says, “This is a kind of invasion, North Korean soldiers working underneath us.”

Hahn says residents had complained of underground vibrations, but the subway does not run beneath them. [CNN]

I’d be much more surprised if the North Koreans didn’t have tunnels under Seoul. Nor is this the most outlandish claim I’ve heard about the extent of those tunnels.