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Events surrounding March 1, 1954
The Daigo Fukuryū Maru (Lucky Dragon No. 5) encountered the fallout from the U.S. Castle Bravo nuclear test at Bikini Atoll, near the Marshall Islands, on March 1, 1954. When the test was held, the Daigo Fukuryū Maru was catching fish outside the danger zone that the U.S. government had declared in advance. However, the test was more than twice as powerful as predicted, and changes in weather patterns blew nuclear fallout, in the form of a fine ash, outside the danger zone. On that day, the sky in the west lit up like a sunset. The Daigo Fukuryū Maru did not get damaged by the shock wave from the blast. However, several hours later white, radioactive dust, called fallout, made up of radioactive particles of coral and sand fell upon the ship. The fishermen attempted to escape from the area, but they took time to retrieve fishing gear from the sea, exposing themselves to the radioactive fallout. The fishermen scooped the highly radioactive dust into bags with their bare hands. One fisherman, Oishi Matashichi, reported that he "took a lick" of the dust that fell on his ship, describing it as gritty but with no taste. The dust stuck to their bodies and the ship. Radiation sickness symptoms appeared later that day. Due to this, the fishermen called the white ash shi no hai (死の灰, death ash). The ash that fell upon the ship was made up of strontium-90, cesium-137, selenium-141, and uranium-237.

Events between March 2–14
During their return, the crew began showing symptoms of radiation poisoning as early as the evening after exposure. They experienced pain, headaches, nausea, dizziness, and diarrhea. Their eyes began to turn red and developed an itchy mucus. By the third day, the men began to develop small blisters on their bodies that had been touched by the radioactive ash. Their faces also began to turn dark. A week into their return journey, their hair began to fall out. On March 11, the ship encountered rough seas causing them to dock late on March 14. This late arrival fortunately caused the contaminated fish to stay within the ship until the next morning. Thus, they were able to throw away much of the tuna once they discovered the radiation.

Events after return to Yaizu port
After their arrival, the men went to the Yaizu Public Hospital where the surgeon, Oi Toshiaki applied a zinc ointment to their faces and sent them home. On March 15, 1954, engineer Yamamoto and deckhand Masuda were sent to the Tokyo University Hospital for treatment. There, they tested Masuda's bone marrow and found his white blood cell count at half the normal level. Japanese biophysicist Nishiwaki Yasushi immediately traveled from Osaka to Yaizu to examine the crew and their boat. He quickly concluded that they had been exposed to radioactive fallout and wrote a letter to the chief of the US Atomic Energy Commission (AEC) asking for more information on how to treat the crew. The crew members, suffering from nausea, headaches, burns, pain in the eyes, bleeding from the gums, and other symptoms, were diagnosed with acute radiation syndrome. The US did not respond to Nishiwaki's letter or to letters from other Japanese scientists requesting information and help, although the United States did dispatch two medical scientists to Japan to study the effects of fallout on the ship's crew and to assist their doctors. The remaining crew members were quarantined in Yaizu North Hospital with all of their clothes and belongings buried on the property. High levels of radiation were found in the men's hair and nails so the hospital cut off the rest of their hair.

The men were all transferred to the Tokyo University Hospital. There they would remain for fourteen months or more in some cases. They were subjected to daily examinations and multiple blood samples. Bone marrow was also drawn from different areas on the men. Their red and white blood cells had dropped significantly causing internal bleeding and blood stools. They had constant high fevers, bled from the noses and gums, and had persistent diarrhea. Their sperm counts also fell to low numbers or in some cases, to none at all. For their treatment, the men were prescribed bed rest and given large quantities of antibiotics and blood transfusions. Dr. Morita Hisao reported that the men had developed acute panmyelosis, a disease that attacked their bone marrow destroying its ability to generate blood.

Around August 20, Kuboyama Aikichi's condition deteriorated. By August 29, he fell into critical condition after developing meningitis. He became delirious and violent, having to be tied to a bed on the floor. Kuboyama soon fell into a coma and developed pneumonia. On September 23, he became the first member of the crew to die from complications of radiation sickness. The remaining twenty-two crew members were released from the hospital on May 20, 1955 after fourteen months. They received yearly checkups to monitor the toll of long term radiation sickness complications.

Health history of the surviving crew
Like the hibakusha, survivors of atomic bombings in Hiroshima and Nagasaki in 1945, the Daigo Fukuryū Maru crew were stigmatized because of the Japanese public’s fear of those exposed to radiation (it was commonly believed to be contagious). The crew tried to stay quiet about their exposure for a number of decades, beginning with their discharge from hospital. A number of the crew also had to move away from their previous places of residence to make a fresh start. However, unlike the hibakusha, the Lucky Dragon No. 5 crew did not receive status of hibakusha and therefore could not qualify for medical care benefits that the survivors of the atom-bomb were given.

Former crew member Susumu Misaki opened a tofu shop after the incident. He died of lung cancer in Shizuoka Prefecture at the age of 92.

Another crew member, Kawashima, tried to earn a living making pouches after his release from the hospital but it failed. Issues in his personal life led to a divorce. Kawashima returned to fishing but died soon after.

After being released from the hospital, Oishi Matashichi left his hometown to open a dry cleaning business. Beginning in the 1980s, he frequently gave talks advocating nuclear disarmament. His first child was stillborn, which Oishi attributed to his own exposure to radiation. In 1992, Oishi developed cirrhosis of the liver but recovered after successful surgery. In 2011, he published a book titled, The Day the Sun Rose in the West: Bikini, the Lucky Dragon and I in English. The book combines his personal story, the story of the Daigo Fukuryū Maru, and declassified documents between the Japanese and American governments about the fallout's damage.

Responsibility and remembrance
The US government refused to disclose the fallout's composition due to "national security", as the fallout's isotopic ratios—namely a percentage of uranium-237—could reveal the design of the Castle Bravo device through radio-chemical analysis. For instance, Joseph Rotblat may have deduced the staging nature of the device by studying the ratio and presence of tell-tale isotopes present in the fallout. As of 1954, the Soviet Union had not yet been successful with thermonuclear staging and such information could have assisted in their development of a thermonuclear weapon. Lewis Strauss, the head of the AEC, issued several denials that claimed the United States were not to blame. He also hypothesized that the lesions on the fishermen's bodies were not caused by radiation but by the chemical action of the caustic burnt lime that is produced when coral is calcined, and that they were inside the danger zone. He told President Eisenhower's press secretary that the Daigo Fukuryū Maru may have been a "red spy outfit", commanded by a Soviet agent intentionally exposing the ship's crew and catch to embarrass the USA and gain intelligence on the test's device.

Later, the United States expanded the danger zone and it was revealed that in addition to the Daigo Fukuryū Maru, many other fishing boats were in the expanded zone at the time. It is estimated that about one hundred fishing boats were contaminated to some degree by fallout from the test. Despite denials by Lewis Strauss concerning the extent of the claimed contamination of the fish caught by Daigo Fukuryu Maru and other ships, the FDA later imposed rigid restrictions on tuna imports.

At first, the US claimed that the extent of the Lucky Dragon incident contamination was trivial. Later, the United States paid Kuboyama's widow and children the equivalent in yen of about $2,800 ($26,700 in 2020). The tragedy of the Daigo Fukuryū Maru gave rise to a fierce anti-nuclear movement in Japan, rising especially from the fear that the contaminated fish had entered the market. The Japanese and U.S. governments negotiated a compensation settlement, with the transfer to Japan of a compensation of $15,300,000, of which the fishery received a compensation of $2 million, with the surviving crew receiving about ¥ 2 million each, ($5,550 in 1954, $52,800 in 2020). It was also agreed that the victims would not be given hibakusha status. The Japanese government pledged that it would not pursue further reparations from the U.S. government.

In the 1990s, Oishi Matashichi worked to erect a memorial for the tuna impacted by the fallout. He gathered small donations and raised enough to erect a stone memorial called "The Tuna Epitaph" at the Tsukiji market. While the stone was being moved they erected a metal plaque within the market.

The Lucky Dragon No. 5 post contamination
When it was first docked at the fish market in Yaizu, the ship gave off radiation that could be detected one hundred feet from the ship. A Geiger counter detected one hundred twenty milliroentgens on the deck of the ship. These high numbers caused Dr. Shiokawa to order the ship moved to Yaizu's north pier and guarded by police. The various items aboard the ship, from cabbage leaves to dead cockroaches, were tested and showed high levels of radiation.

On March 22, the future of the ship became a debate between the U.S. military, Japanese government, and scientists. The United States military proposed moving the ship to their base at Yokosuka to be disposed of. Foreign Minister Ando argued that the ship should be kept for three months, save parts for scientific research, and scuttle the rest of the ship. Professor Nakaizumi of Tokyo University argued that the Japanese government should purchase the ship for residual radiation research. On August 22, the ship was purchased by the Japanese government and towed to the Tokyo University of Fisheries. In 1956, the ship was refitted and renamed as Hayabusa Maru and used as a training vessel. It was put to use as a training vessel.

The public outcry against the government's handling of the Daigo Fukuryū Maru, its crew, and the lack of information about fallout kindled an anti-nuclear and anti-American movement. After the ship docked and received national attention, municipal, prefecture, and national assemblies passed resolutions in support of limiting or banning nuclear testing. After the death of Kuboyama, the movement expanded. In Tokyo, the National Council for a Petition Movement to Ban Atomic and Hydrogen bombs was founded. This group began an annual ban-the-bomb convention in 1955. At the first World Conference, a new organization called the Japan Council Against Atomic and Hydrogen Bombs formed to expand the the movement and moved to include the hibakusha. The anti-nuclear movement eventually culminated in demonstrations against the United States-Japan Security Treaty in 1960.

On June 11, 1970, the Lucky Dragon No.5 received media attention as it still sat in garbage within the canal. The area was cleaned up and made into a park. The ship was pulled from the water and put on public display as a symbol of opposition to nuclear weapons in an exhibit hall in Tokyo.

The Daigo Fukuryū Maru was deemed safe for public viewing and was preserved in 1976. It is now on display in Tokyo at the Tokyo Metropolitan Daigo Fukuryū Maru Exhibition Hall.

Media
The Toho Film Gojira (Godzilla, 1954), was inspired in part by this event. The ship itself appears on a poster in 2001's Godzilla, Mothra, King Ghidorah: Giant Monsters All-Out Attack, which also features Godzilla coming ashore and wreaking havoc in the Yaizu area.

A poem, Japon Balıkçısı (The Japanese Fishermen), was written in 1956 by Turkish poet Nâzım Hikmet Ran about the events.

Ralph Lapp wrote The Voyage of the Lucky Dragon, which was published in 1958. It was reviewed on the front page of The New York Times Book Review.

A film version of the events, Daigo Fukuryū Maru (1959), was directed and screenwritten by Kaneto Shindo, and produced by Kindai Eiga Kyokai and Shin Seiki Eiga.

The artist Tarō Okamoto, created the painitng Moeru hito (Burning People) in response to the Lucky Dragon No. 5. The painting was displayed in the Fifth World Conference Against Atomic and Hydrogen Bombs in 1959. He also included the ship in his mural Myth of Tomorrow in Shibuya railway station.

External Sources
Daigo Fukuryu-Maru Exhibition Hall website: http://d5f.org/en/