In this episode of Stuff You Should Know, the hosts delve into the harrowing story of Unit 731, a secret Imperial Japanese Army unit that conducted inhumane medical experiments during World War II. The rise of ultra-nationalist sentiment in Japan and its imperial ambitions set the stage for the atrocities committed by Unit 731, which exploited prisoners and local populations for testing biological weapons and torture methods.
The episode sheds light on the disturbing details of Unit 731's vivisections, disease experiments, and mass production of pathogens like cholera and anthrax. It also examines the subsequent cover-up, with the U.S. granting immunity to Unit 731 members in exchange for their data, leaving many to pursue successful careers without facing accountability for their actions.
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As Japan modernized in the late 1800s and early 1900s, ultra-nationalist sentiment grew, fueled by dissatisfaction over Japan's treatment after WWI and the economic impact of the Great Depression, the podcast states. The ultra-nationalist Kwantung Army independently took control of Manchuria and installed a puppet regime, furthering Japan's imperialist ambitions.
Unit 731 was a secret Imperial Japanese Army unit led by General Shiro Ishii, an ultra-nationalist. Established in 1936 in lawless Manchuria to exploit "inferior" local populations, it conducted horrific medical experiments on prisoners, including vivisections without anesthesia, exposure to diseases, and testing of weapons and torture methods.
The podcast reveals Unit 731 rapidly grew its capacity to mass-produce deadly pathogens like cholera and anthrax as biological weapons. Researchers tested dispersal methods such as contaminated food and infected fleas. Tens of thousands of civilian deaths in Manchuria resulted from Unit 731's biological weapons testing.
Despite knowledge of Unit 731's atrocities, the U.S. granted immunity to its members in exchange for their data to aid America's bioweapons program, the podcast states. Many went on to successful careers, with some receiving prestigious awards. Japan resisted acknowledging Unit 731 until the 1980s and hesitates teaching this history.
1-Page Summary
In the late 1800s and throughout the 1920s and 1930s, Japan underwent significant changes as it modernized its military and economic systems in an effort to become a global superpower. This period saw the rise of ultra-nationalism, leading to the invasion of Manchuria and the establishment of a Japanese puppet government there.
Japan strove to emulate the European powers and the United States in the late 19th century by modernizing the country, including adopting a modern military framework. Over time, this led to a burgeoning ultra-nationalist movement within Japan, which believed in the country's genetic and cultural superiority over its neighbors. This sense of pride was damaged when Japan was excluded from the division of spoils after World War I despite being on the winning side, and the nation's pride and economy were further impacted by the Great Depression. These factors contributed to the swell of nationalistic and ultra-nationalistic fervor within Japan.
The Kwantung Army, described as operating independently from the Tokyo-con ...
The rise of ultra-nationalism in Japan and the invasion of Manchuria
Unit 731 was an Imperial Japanese Army unit that committed inhumain medical atrocities during World War II, mainly against Chinese and Russian individuals.
General Shiro Ishii, a Japanese army doctor fascinated by biological weapons, led the covert operations of Unit 731. This unit, formed in 1936, was strategically placed in the lawless region of Manchuria, far from Japan, to conduct heinous experiments without oversight and to exploit the local populations, who were viewed as "inferior" and used as test subjects.
Unit 731 started as the Epidemic Prevention Research Laboratory in Tokyo, later transitioning to Manchu Detachment 731. Ishii's operation displaced residents from around eight villages to establish the primary base, which was designed like a prison camp, complete with barbed wire and guard towers. Staffed by professionals in various medical fields, Unit 731 sought exhaustive knowledge about human responses to diseases, injuries, and torture.
The horrific experiments were carried out at a large complex in Pingfang. Workers subjected people to gruesome tests, which included assessing the impact of weapons on restrained human bodies. Among the cruelest acts, Unit 731 conducted medical torture on captured U.S. airmen in May 1945, performing fatal surgeries without anesthesia.
Ishii, a figure in the ultra-nationalist wing of the Japanese military, embraced human experimentation to pursue biological weaponry, using Unit 641 to carry out these acts under the guise of scientific research. The unit's activities, conducted in a climate of military independence and extreme nationalism, involved a wide demographic, from babies to the elderly, and did not spare pregnant women or even newborn babies from their gruesome studies.
The establishment and operations of Unit 731
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Unit 731 was initially established with the mandate to conduct legitimate medical research to find treatments for diseases that affected Japanese soldiers, but under General Ishii's lead, it notoriously shifted focus toward the development of biological weaponry and conducted inhuman experiments.
The researchers at Unit 731 conducted experiments on prisoners, expanding their tests from starvation and diseases to the effects of more harmful substances such as anthrax and other pathogens. Unit 731 could produce a mind-boggling trillion microorganisms every few days, enabling them to mass-produce biological agents with the intent to weaponize them.
The unit experimented with a variety of delivery methods for their biological agents, including making bombs out of poison gas or plague cultures. They also utilized animal fleas infected with the plague as payloads to be dropped onto towns and studied the effects of contaminated food and water.
As part of their experimentation, personnel infected prisoners with diseases such as malaria, cholera, typhus, and plague. Sadly, no prisoner at Ping Fong survived these inhumane tests; there was a 100% mortality rate among those subjected to experimentation. Unit 731 also tried infecting Chinese civilians by dropping disease-infested fleas on different cities, releasing dogs with cholera into villages, and distributing salmonella-laced chocolate to children. They found that spreading plague-infected fleas mixed with grain, ...
The development and attempted deployment of biological weapons by Unit 731
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After World War II, a disturbing layer of international politics played out as the United States, seeking an edge in biological warfare research during the early Cold War, made morally questionable choices that affected the course of justice and public awareness regarding Japan's notorious Unit 731.
The podcast reveals that the existence and activities of Unit 731, a covert biological and chemical warfare research and development unit of the Japanese army, were known at the highest levels of the Japanese military and government. This unit, led by General Shiro Ishii, was kept top-secret despite its substantial funding and key role in Japan's military strategy.
When the war ended, Unit 731's facilities were destroyed, the remaining prisoners and staff were killed, evidence was demolished, records were obliterated, and participants took oaths of silence, purposefully obscuring the unit's hideous legacy. Those involved went to great lengths to cover their atrocities, including the production of biological weapons potent enough to decimate global populations.
As American forces began to investigate, they realized that the valuable biological warfare data accumulated by Unit 731 could potentially be commandeered by the Soviets. The U.S. made a strategic decision to grant immunity to Unit 731 members, including General Ishii, in exchange for their research rather than prosecuting them for war crimes. Some members were even paid for their data and consulted at Fort Detrick, Maryland, aiding America's own biological warfare program.
Former scientists of Unit 731 re-entered Japanese society, rose to prominence, and became revered figures in their respective fields. Individuals such as Masaji Kitano, second in command at Unit 731, co-founded Green Cross, a significant pharmaceutical company in Japan. Shiro Ishii, the head of the unit, purportedly provided consultative services for the U.S. bioweapons program and was celebrated as a doctor within Japan. Even the leader of horrific frostbite experiments at Unit 731 went on to become the president of the Kyoto Prefectural University of Medicine. Notably, Amitani Shogo, formerly engaged in communicable disease research at Unit 731, was awarded the Asahi Prize for his work—work that was likely founded on ...
The cover-up and lack of accountability for Unit 731's crimes after the war
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