Through a cold mist, South Korean troops scan their frontier for signs of an attack by warmongering North Korean leader Kim Jong-Un.
Behind razor wire and machine gun nests, nervous soldiers man artillery positions ready to blitz the dictator’s forces dug in less than a mile away.
But while their eyes peer into the mist, the onslaught may yet begin where they cannot see… 100 feet below their boots.
Because military chiefs fear Kim’s troops have dug a series of secret underground tunnels reaching behind the South’s defensive lines.
And in one nightmare scenario they believe up to 30,000 elite commandos are ready to pour through them.
Yesterday as the South braced itself for war between the countries for the first time since 1953 amid Kim’s increasing sabre-rattling, a military source told us: “We are at high alert and have seen little movement. But the North has already tried four times since the armistice to launch a tunnel invasion.”
Four have been found over the years… three in the 70s and the last in 1990. “We haven’t found one since then, but we are sure they are there,” added the source, grimly. All along the 160-mile border, which passes just four miles from South Korea’s capital Seoul, we saw soldiers and marines at gun positions pointing north across a demilitarised zone agreed almost 60 years ago.
More than four million died in the 1950-53 war, sparked by a Soviet-backed North invasion that ultimately failed.