Two Australians have revealed a rare glimpse inside the tourism scene of North Korea.
The tunnels are hundreds of feet below the earth's surface and stretch from the North Korean side of the heavily fortified Demilitarized Zone into neighbouring South Korea.
A Melburnian who works as a North Korea tour guide has a fresh perspective on the hermit nation.
Kiwi freeskier Sam Smoothy is used to going off-piste - but when it comes to strange ski destinations, North Korea is right up there.
North Korea: how to visit the world's most secretive country
Would you risk travelling to a country where you can be imprisoned for no good reason for an unlimited amount of time?
A place so bizarre it seems almost unbelievable. And I can't wait to go there.