Secret arrive during the 1st Gaon Chart K-POP Awards at Blue Square on February 22, 2012 in Seoul, South Korea. (Photo by Chung Sung-Jun/Getty Images)

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.

A pilot demonstrates an aircraft manufactured by US-based LIFT Aircraft in front of Osaka Castle in Osaka on March 14, 2023. (Photo by JIJI Press/AFP Phoot)

Jade Cargill takes out Alba Fyre and Zoey Stark during WWE's Clash at the Castle, Premium Live Event at The OVO Hydro on June 15, 2024 in Glasgow, Scotland. (Photo by WWE/Getty Images)

Swedish model Kelly Gale shows off stunning figure in animal print swimsuit in the second decade of April 2022. The catwalk star, 26, posed in a beachwear shoot for Victoria’s Secret Swim. (Photo by Victoria's Secret Capture Media Agency)

Victoria's Secret Angel Martha Hunt celebrates the 2015 What Is s*xy? List in San Diego on September 26, 2015 in San Diego, California. (Photo by Joe Scarnici/Getty Images for Victoria's Secret)

Victoria's Secret model Adriana Lima poses with her Madame Tussaud's wax likeness at a reveal event at the Victoria’s Secret store in Herald Square in the Manhattan borough of New York November 30, 2015. (Photo by Brendan McDermid/Reuters)

A member of the USA Knights team is seen wearing a face-like helmet shield during the International Medieval Combat championships at the castle of Belmonte, May 4, 2014, in Belmonte, Spain. The steel armor the knights wear can cost up to $10,000 and weigh 80 pounds. (Photo by Juan Naharro Gimenez/Getty Images)