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Unit 731: The horrors of biological warfare experiments that the world forgot

In the 1930s through the second China-Japan war and till the end of World War II, Unit 731 carried out horrific human experiments on the countless prisoners and villagers at Harbin, Northeastern China.

The tales of World War II are replete with innumerable accounts of horror, atrocity and the absolute worst of human depravity. Among the kill count of tens of millions, there are stories that often go neglected. While Germany’s Holocaust against the Jews is well documented, there are stories of atrocity that have gone largely undiscussed. One of the lesser-known tales is that of Unit 731.

Unit 731 was the name of the Imperial Japanese Army’s covert biological and chemical warfare division. In the 1930s through the second China-Japan war and till the end of World War II, Unit 731 carried out horrific human experiments on the countless prisoners and villagers at Harbin, Northeastern China. The Unit was officially known as the Epidemic Prevention and Water Purification Department of the Kwantung Army.

As per reports, Japan’s biological warfare program was started in the 1930s, after biological warfare was banned in the Geneva Convention in 1925. The Kwantung Army, which had at that time controlled large swathes of China, made the headquarters near the Pingfang district in Harbin and evicted around 8 villages to make their facilities. One of the main reasons for selecting Harbin was that ‘test subjects’ were readily available. The Unit 731 was led by General Shiro Ishii, a combat medical officer of formidable reputation.

Unit 731 members, image from 2017 NHK Documentary

“Wooden logs”

In the records of Unit 731, the test subjects were usually criminals, poor locals who signed consent forms for a small payment and Russian, Korean or Mongolian captives. One account, published in New York Times, narrates an experiment where a Russian mother and daughter were placed inside a thick glass chamber and had poisonous gas released inside. The mother sprawled herself over the child, as doctors outside gathered to record and study their convulsions, and time taken to die. Another account by a former Japanese medical worker named Takeo Wano narrates that a ‘western man’ was cut vertically in two pieces, and was ‘pickled in a six-foot glass jar of formaldehyde.

The test subjects were not named, there were just called Marutas, ‘wooden logs’ in Japanese.

Pathogen testing, studying ‘plagues’ on live human specimen

One of the most dangerous aspects of Unit 731 was the testing of biological warfare weapons, on live populations. Doctors under Shiro Ishii infected prisoners with live pathogens and studied how the diseases spread. To study infections, they sent infected persons among healthy prisoners. Some ‘logs’ got infected with multiple pathogens, to find out the cross-reactions of different diseases. Rats carrying the bubonic plague were let loose among cages of prisoners.

To study the spread of sexually transmitted diseases, Unit 731 doctors forced subjects to rape and impregnate female prisoners. Some women were forcefully impregnated to study disease progression during pregnancy and foetal transmission. Foetus, newborns were test subjects too.

Unit 731 experimenting on prisoners, image via SCMP

Vivisections

One of the most harrowing tales of the atrocities of Unit 731 was the accounts of vivisection, cutting open live prisoners, often without anaesthesia. In an NYT report, a former Unit 731 member, under the condition of anonymity, has described how they used to cut open prisoners while they screamed. The purpose of vivisection was to study the spread of pathogens into the internal organs of test subjects, while they were alive.

The intention was to develop ‘plague bombs’, using humans to spread diseases among Japan’s enemies. They experimented with plagues, anthrax and cholera.

vivisections being carried out, source celestialkitsune.com

Field trials

Unit 731 also dropped ‘plague bombs’ over nearby Chinese villages and towns, to see how many and how effectively they can kill populations. They were trying to see whether they could start major outbreaks, and as reports suggest, they could. There is no accurate estimate as to how many people the Unit killed, some say around 3000, but Chinese accounts say the number may be far greater, as there were numerous outbreaks in villages due to the ‘field trials’. Poisonous gas was already in use by Japanese forces against Chinese soldiers and Unit 731 often tested the potency of gases among prisoners.

Test subjects were also taken to a ‘test grounds’ called Anda, where subjects were bombarded with weapons to study the efficacy. Even aeroplanes were used to spray pathogens over villages, to see how many can be killed. Plague outbreaks were reported in Ningbo and Changde at that time. It was later found out that the outbreaks were Unit 731 experiments, where they had released disease vectors into populations.

In 1942, Unit 731 infected water bodies in Zhejiang province with cholera and typhoid cultures, but they soon stopped because the outbreaks went out of control, killing over 1700 Japanese soldiers along with the intended Chinese targets.

The ultimate goal of the extensive field trials was to use the ‘plague bombs’ to start disease outbreaks in enemy countries, particularly the USA.

Not a rogue unit

Unit 731 was by no means a rogue unit containing some ‘mad scientists’ who carried out horrible human experiments. The works of the Unit was sanctioned by the Japanese government and it had wide authority, carrying our experiments in several locations and publishing detailed reports. Many Japanese scientists and researchers also argued that ultimately the Unit’s experiments were intended to find scientific cures and enable their forces against biological deterrents.

Though the then Japanese Emperor Hirohito had never openly acknowledged Unit 731, his brother, Prince Mikasa had once toured the headquarters at Harbin, China. As per the NYT report, he had written in his memoirs that he was shown films on how Chinese prisoners were made to march in plains of Manchuria for poison gas experiments.

Ultimate goal: Starting epidemics in the USA

There are accounts of Japanese generals experimenting with balloons loaded with bombs and sending them with a prevailing wind to land on coastal US states. Though the US government had not released reports during the WWII, there were reports of bomb balloons killing six people in Oregon.

The bomb balloons were reportedly precursors, of balloons that would have eventually carried plague bombs. Many Japanese generals were pushing for such an attack, but as per reports, it was a former PM named Hideki Tojo, who fiercely argued against a biological warfare against USA in mid-1944.

The NYT report states that when USA was preparing to attack the island of Saipan, Japanese army had sent a submarine loaded with biological weapons, but the submarine was sunk in the pacific.

As Japan was almost at the verge of losing, a desperate plan was made to attack California, code-named ‘Cherry Blossoms At Night. Suicide pilots were to carry plague bombs in Japanese submarines that were equipped to carry planes (I-400 class submarines of Japan could carry 3 Aichi M6A Seiran planes). However, the operation was never carried out. Reasons remain unclear.

The aftermath: USA silenced the atrocities of Unit 731, bought the data and let the scientists go

Despite the despicable crimes against humanity, the main scientific and operational brains behind Unit 731 were never punished or even faced a trial.

When USA dropped nuclear bombs on Hiroshima and Nagasaki, making it clear that the war was over, Unit 731 used dynamites to destroy its headquarters in China. However, the work, the research and the scientists of Unit 731 were found to be too valuable for the USA. Just like Operation Paperclip, where notorious Nazi war criminals were secretly smuggled to the USA and were given facilities to carry out their work, Unit 731 scientists bought their freedom in exchange for the scientific data on an extensive and effective biological warfare program.

Shiro Ishii lived a comfortable life in Tokyo till old age. His faithful associates raised in ranks and were placed in important positions. So many years later, while China remembers its countless victims with a museum at Harbin, Japan’s acknowledgement has been reluctant. In later decades of the 20th century, many former unit 731 workers had come out to narrate their experiences and the discussions were opened. Books have been written about the Unit and its works. Russian media outlet RT had made a documentary movie, called ‘Death Factory’, detailing Unit 731’s atrocities.

As per reports, in 1945, US general Douglas McArthur had received intelligence about the Unit’s work from secret documents. He reported granted Ishii and his associates immunity from prosecution, in exchange for their scientific documents.

Many members of Unit 731 were arrested by the Soviet Red Army and were tried at the Khabarovsk War Crime Trials.

In 2017, Japanese national broadcaster NHK had released a documentary detailing the atrocities of Unit 731. It had caused a huge uproar in Japan at that time.

However, the atrocities and the countless tales of suffering of the victims are lost forever. They are now fleeting shadows of forgotten complicity, rendered to the obscure pages of history among a million others.

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