The world is wary of increasingly aggressive threats of nuclear war by North Korean dictator Kim Jong-Un, or that’s what the mainstream media wants us to believe.

Last month, North Korea threatened nuclear strike on the United States if Donald Trump tries to take out Kim Jong-Un. In the first week of August, Trump vowed to respond with “fire and fury” if North Korea persisted in threatening the United States.

On Sunday, Kim Jong-Un, who is currently threatening to conduct nuclear missile tests in the waters of Guam, warned that the United States will be ‘pouring gasoline on fire’ by conducting annual military exercises with South Korea next week, adding that there was nowhere in America that can dodge its ‘merciless strike’.

While the world knows Trump will issue another provocative warning to North Korea, the world doesn’t seems to understand why Kim Jong-un is not afraid of pushing Pyongyang closer to the edge of an all-out nuclear war.

It seems we finally have an explanation: North Korea boasts the world’s deepest underground metro system, which doubles up as a nuclear bunker; meaning Pyongyang residents can hide 360 feet underground if a nuclear war breaks out between North Korea and the United States.

Australian travel bloger Elliott Davies, a software developer, took a series of photographs that reveal the inside of Pyongyang’s 360 feet deep metro system, which includes two lines with a combined length of 18 miles beneath North Korea’s capital. He told The Sunday Express:

“This may sound mundane, but the previously restricted Pyongyang Metro is surely one of the most mysterious, yet beautiful transit systems on earth, each station uniquely themed in ultra-nationalism, parading North Korea’s revolutionary goals and achievements to impressionable commuters. In many ways, it’s a small museum, most of which formerly hidden from outside eyes and subsequently shrouded in conspiracy theories.”

While it is usually busy with commuters, the depth of the metro system means citizens could also use it as a shelter should tensions between North Korea and the United States boil over into a full-scale war.

Each station is named after the revolution: Comrade, Red Star, Glory, Liberation, Signal Fire, Rehabilitation, Victory, Paradise, Restoration… not named after places though.

Going down the 120 meters takes just few seconds but you feel like being in a movie as the revolutionary music and patriotic songs are played all around from the loudspeakers.

The trains are old carriages from Germany which were bought up by North Korea in 1999 as they were heading for the scrap heap.

It’s an almost four-minute descent to reach the train platforms, and, to the top and bottom of the escalators, the hallways are protected by thick steel blast doors.