The drills have taken place in smaller towns and cities, especially along the east coast, although there have been none in the capital Pyongyang yet.
As tensions heighten between North Korea and the rest of the world, especially the US, the unprecedented drills could betray Kim Jong-un’s war fears, despite his bullish rhetoric.
The unprecedented drills saw citizens practice leaving their homes behind or blacking out their light sources in the event of a bombing campaign.
Chun In-bum, a recently retired South Korean general, said he had never seen anything like this before. He said: “They must realise how serious the situation is.”
However experts are divided on whether the regime genuinely feels more threatened than before, or is simply seeking to create the perception that it wants to take care of its citizens.

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Meanwhile the world’s super-rich have been investing in luxury nuclear bunkers that will allow them to live out the apocalypse in style.
Over the weekend, US Defence Secretary General Jim Mattis warned of a “massive military response” if North Korea does launch a nuclear attack.
Mr Mattis also warned Pyongyang that North Korea’s military was no match for the US-South Korean alliance and that diplomacy was most effective “when backed by credible military force”.
It comes as China warned Kim Jong-un to put a stop to his nuclear tests amid fears the unstable test site could collapse, leading to a catastrophe for both states.
Scientists from Beijing believe the Punggye-ri nuclear facility is unstable and that just one more explosion could blow the top off of Mount Mantap, beneath which all six of North Korea’s nuclear tests thave been conducted.
That could lead to the mountain collapsing, causing radioactive waste to escape and blow aross the border into China just 50 miles away.
Researchers from the Chinese Academy of Sciences’ Institute of Geology and Geophysics warned Pyongyang delegates of the risk during a briefing in Beijing soon after North Korea’s last nuclear test on September 3, according to the South China Morning Post.
The meeting occured two days before North Korean Foreign Minister Ri Yong-ho told reporters at the United Nations Assembly in New York that Pyongyang was considering conducting a hydrogen bomb test over the Pacific Ocean.