Only after World War II did the secret spill: Ōkunoshima, located in the Inland Sea of Japan between Hiroshima and Shikoku, was the top-secret site for manufacturing chemical warfare. When the factories were closed down, a number of exotic wild rabbits were seen freely roaming the island. They were assumed to have been the test subjects for the chemical weapons, which the military failed to eradicate when the factory was demolished.

An mechanic in Brick Lane Bikes repairs a fixed wheel bike in their shop in Shoreditch on June 14, 2011 in London, England. The UK bike industry has seen a dramatic rise in the number of people building their own custom bikes or purchasing bespoke bikes. (Photo by Oli Scarff/Getty Images)

A worker paints the face of a realistic pet plushie, at the Pampanga Teddy Bear Factory, in Angeles City, Pampanga province, Philippines on March 10, 2023. (Photo by Lisa Marie David/Reuters)

Actors wrapped in blankets react at the set of the post-apocalyptic movie “Zombie Era” at an abandoned factory complex in Langfang, Hebei province, China December 16, 2016. (Photo by Damir Sagolj/Reuters)

A man takes a block of ice out of an ice factory for sale in Iraq's southern city of Basra on July 8, 2023. (Photo by Hussein Faleh/AFP Photo)

A labourer drinks water from a pipe at a brick kiln on a hot summer day in Sukkur, Sindh province on May 23, 2024. The Pakistan Meteorological Department said temperatures are expected to hit as high as 50 degrees Celsius (122 degrees Fahrenheit) in parts of rural Sindh. (Photo by Shahid Ali/AFP Photo)

An Afghan laborer works at a brick kiln, in Jalalabad, Afghanistan, 24 February 2020. Afghan President Ghani said on 21 February, said that a seven-day reduction in violence promised by the Taliban will determine the government's next steps in Afghanistan's peace process. The Taliban has announced a decrease in hostilities in an agreement with the United States as a preliminary step to signing a peace deal with Washington on 29 February. (Photo by Ghulamullah Habibi/EPA/EFE)