North and South Korea are in an underground war - is Kim Jong Un winning?

The neighbouring countries have long been embroiled in a war of information. But has there been a recent shift in who has the ‘upper hand’?

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The border between North and South Korea is swamped with layers of dense barbed-wire fencing and hundreds of guard posts. But dotted among them is something even more unusual: giant, green camouflaged speakers.

As I stood looking into the North one afternoon last month, one of the speakers began blasting South Korean pop songs interspersed with subversive messages. "When we travel abroad, it energises us", a woman's voice boomed out across the border - an obvious slight given North Koreans are not allowed to leave the country.

From the North Korean side, I could faintly hear military propaganda music, as its regime attempted to drown out the inflammatory broadcasts.

North and South Korea are technically still at war, and although it has been years since either side shelled the other, the two sides are fighting on a more subtle front: a war of information.