A Google Earth image has lead to several stories about supposed underground airstrips in North Korea that would allow NK fighters to pop out just before taking flight.
Excellent! I thought. Build more. It's not like the U.S. could shut one of those down-blocking and perhaps destroying the aircraft inside- with a single good strike to the tunnel mouth! Silly North Koreans.
Unfortunately, as In From the Cold explains, this idea from a bad 60s James Bond flick is unlikely to be true. Oh, well.