North Korean military engineers are completing an underground runway beneath a mountain that can protect fighter aircraft from attack until they take off at high speed through the mouth of a tunnel.

The 6,000ft runway is a few minutes’ flying time from the tense front line where the Korean People’s Army faces soldiers from the United States and South Korea.

The project was identified by an air force defector from North Korea and captured on a satellite image by Google Earth, according to reports in the South Korean press last week.

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It is one of three underground fighter bases among an elaborate subterranean military infrastructure built to withstand a “shock and awe” assault in the first moments of a war, the defector said.

The runway, reminiscent of the Thunderbirds television series, highlights the strange and secretive nature of the regime that provided the expertise for a partially built nuclear reactor in Syria, film of which was released by the CIA last week.

The reactor was destroyed by Israeli aircraft last September in an operation that may have killed or injured North Koreans at the site in the remote deserts of eastern Syria.

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