North Korea's Underground Railway Is Very Busy

North Korean soldiers march along the North Korean side of the
border fence near Dandong, China. Ng Han Guan / AP

Aiding North Korea Defectors: A High-Stakes Spy Mission -- L.A. Times

A recent operation offers a peek inside the 'underground railroad,' a network of safe houses and secret border crossings that assists in the escape of North Korean refugees.

Reporting from Seoul - As he cased the security at the foreign embassies in Hanoi, the 78-year-old retiree was seized with sudden self-doubt. He was certainly no John le Carre. Who was he to play spy?

But this wasn't a game. Waiting in nearby safe houses were nine North Korean defectors whom Kim Sang-hun had helped spirit into Vietnam from China -- among them a young doctor and his wife, a mother and daughter, and a woman who'd been sold as a sex slave in Beijing.

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My Comment: This reminds me of the underground railways that brought black slaves from the U.S. south to Canada in the early 1800s.