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Eight skeletons were found in the hull of one wooden boat that washed ashore on Miyazawa beach in the northwest of Japan's main island Honshu, the Akita Coast Guard said Monday.
The unidentified boat was spotted drifting off shore on Friday but the grim discovery was only made when it reached land.
While officials would not confirm the boat was from North Korea, it matches a spate of vessels and debris that have ended up on Japan's west coast.
Satoru Miyamoto, a professor at Seigakuin University and an expert on North Korea, said the number of ships washing ashore on Japan's coast has risen since 2013.
"It's after Kim Jong Un decided to expand the fisheries industry as a way of increasing revenue for the military. They are using old boats manned by the military, by people who have no knowledge about fishing," Miyamoto said. "It will continue."
Strange boats ashore
- November 15 : Three North Koreans rescued by the Japanese coast guard off Noto Peninsula in Ishikawa prefecture. Three dead bodies found on the boat the following day. All bodies and survivors returned to North Korea.
- November 17 : Four dead bodies discovered on board another boat which washed ashore in the same area.
- November 23 : Eight North Koreans rescued after boat washed up on shores of Akita prefecture.
- November 27 : Eight skeletons found aboard vessel found on Akita prefecture beach.
Desperate situation
At the time, experts said the bodies on the boats could be those of refugees or fishermen, driven into more dangerous waters by desperation from North Korea's well-documented food shortages.
Several North Korean fishermen rescued earlier this month by Japanese authorities were also returned to the country, on their request, officials said, indicating that at least some of those washing up on their neighboring nation's shores are not attempting to flee there.
The man's condition, as reported by South Korean doctors, gave insight both into why people may attempt to flee the autocratic country and why fishermen may be heading out into more dangerous waters in search of bigger catches.
Choi Min-ho, a professor at Seoul National University College of Medicine who specializes in parasites, told CNN the use of human fertilizer on crops and poor sanitary conditions led to the transmission of parasitic cysts in North Korea.
Intestinal worms are typically transmitted through contact with feces or unwashed hands. Infections are easily treated with drugs.
"It is a vicious cycle that is hard to stop in North Korea. They are so desperate to make ends meet that they cannot take proper preventive measures," he said.
North Korean defector and former army officer Kang Ri Hyuk told CNN last week that conditions in his home country were "brutal" before he left four years ago.
"Everyone was hungry, even the soldiers," he said. "The UN is sending rice and fertilizer and it all goes to the ranking officials under (North Korean leader) Kim Jong Un. There are many soldiers who also die from disease because they're not given medical treatment."
North Korea suffered a devastating famine in the 1990s which killed as many as 1 million people, and the UN estimates as much as 70% of the country's 25 million people still don't eat a "sufficiently diverse diet."
CNN's Yoko Wakatsuki, Chie Kobayashi, Jake Kwon and Ben Westcott contributed reporting.