North Korea prepares for a new nuclear test by excavating an underground tunnel, Japan warns.
The country's foreign minister, Taro Kono, said: "[North Korea] is doing everything to prepare for the next nuclear test: it is just taking earth out of an underground tunnel where the previous test was done."
The Minister said earlier that the secret state "does not disclose its intentions to the outside world in terms of denuclearization"
Just days after Kim Jong-un promised to repel his beloved nuclear weapons, his safety and threats should be guaranteed the US is stopped against North Korea.
Late last year, the tyrant declared his country a full nuclear power After firing a new rocket, he claimed that he was capable of hitting anywhere on the planet.
Nuclear devices are often tested underground to prevent the radioactive material released during the explosion from reaching the bottom and polluting the environment ̵
The release of radiation from an underground atomic explosion – an effect known as "venting" – would provide clues to the technical composition and size of a country
A test site is carefully geologically surveyed to ensure its suitability – usually in a place far from population centers.
The nuclear device is normally placed in a borehole or tunnel between 200-800 meters below the surface
Last year, a tunnel in a subterranean North Korean nuclear facility is said to have collapsed.
Up to 200 people are reported to have died on the Punggye-ri nuclear test site in the northeast of the country.
According to reports, the accident was caused by Kim Jong-us sixth nuclear test, which weakened the mountain, the report said.
Former British Defense Secretary Sir Michael Fallon previously warned that Britain would be at risk from North Korea's long-range missile program as some cities are closer to one another than American targets.
Revised estimates suggest that the total number of rogue rockets is between 13 and 21. 
Satellite images of Jong-us main missile test site in August showed that North Korea's weapons were more powerful than originally assumed
Careful analysis of North Korean test sites
This article originally appeared in The Sun and was published by courtesy.