Images dating from October and early November show addition of fourth tunnel at test site Punggye-ri, say US researchers

This article is more than 4 years old

This article is more than 4 years old

Satellite photographs from October and early November indicate North Korea is digging a new tunnel for nuclear testing, a US research institute said on Wednesday.

A report on 38 North, a North Korea monitoring website run by Johns Hopkins University’s school of advanced international studies in Washington, said the images showed significant construction since April at Punggye-ri, on North Korea’s east coast, where three previous nuclear tests were conducted.

However, there are no signs any testing is imminent, it said.

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The commercial images showed excavation of a new tunnel in addition to the three others where North Korea has either conducted nuclear tests or excavated tunnels in the past, the report said.

The report said: “While there are no indications that a nuclear test is imminent, the new tunnel adds to North Korea’s ability to conduct additional detonations at Punggye-ri over the coming years if it chooses to do so.”

On 30 October, South Korea’s Yonhap news agency quoted a South Korean government source as saying there was active movement of workers and vehicles working on a new tunnel at the site.

The source said this indicated an intention to conduct a nuclear test “at some point”, though this did not appear to be imminent.

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North Korea conducted its last nuclear test in 2013, drawing international condemnation including from China, its main diplomatic ally. North Korea is under United Nations sanctions that ban trade that can fund its arms program.

Pyongyang has vowed to continue to conduct nuclear tests and to launch what it says is a rocket to put a satellite into orbit, something South Korea and its main ally, the US, say would be a disguised long-range missile test.

American and South Korean defence chiefs have expressed “grave concern” over North Korea test plans and urged it to cease all activities related to its nuclear programme immediately.