No idea how credible this person is, but it interestingly mentions an island that is/was a North Korean submarine base. Connection to global tunnel network?

2014: "Im Cheon-yong says that witnessing mentally and physically handicapped children being used in chemical weapons tests carried out by the North Korean military was the last straw.

"And then we have what they call 'field learning'. For the biological and chemical warfare tests, we needed 'objects'," he added. "At first, they used the chemical agents on mice and showed us how they died. Then we watched the instructors carrying out the tests on humans to show us how a person dies. I saw it with my own eyes," Im claimed. He said he got repulsed by what he had witnessed and managed to get over the border into China and arrived in South Korea in the mid 1990s.

According to Im, experiments on humans date back to the late 1960s and one of the first facilities used for chemical and biological weapons tests on humans was constructed on the military controlled island of Mayang-do, just off the east coast port of Sinpo, which is also North Korea's most important submarine base. A second facility was subsequently constructed on an island off the west coast of the peninsula, while a third is in operation alongside a political prison camp outside the city of Hyanghari, the defector claims.

"They use anthrax bacterium as well as 40 different types of chemical weapons that the regime has developed itself," Im said. "Through these experiments, they know the effects of the weapons and the amounts to be used."

To give the regime's actions legitimacy, children born with mental or physical disabilities are not taken away by force - although, in reality, few citizens of North Korea have the right to resist the authorities' will, says Im.

"They want to do it 'legally' and they don't want to lose the support of the people, so they buy disabled children from their parents for a few kilograms of rice," he said. "The officials say they will take care of the children."

dw.com/en/north-korean-defector-details-human-experiments/a-18161851