A drone photo taken on Sept. 16, 2025 shows a view of the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

People visit the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Wang Jianwei)

A visitor leaves a note at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

People visit the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Wang Jianwei)

People visit the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

Visitors shed tears at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Photo by Zhang Dawei/Xinhua)

People walk past a poster of the film "Evil Unbound" at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Wang Jianwei)

People visit the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Wang Jianwei)

Visitors lay flowers to victims of crimes committed by Unit 731 at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

People walk past a poster of the film "Evil Unbound" at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Photo by Zhang Dawei/Xinhua)

People visit the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Wang Jianwei)

Visitors look at the drawing of bacteria bomb developed by Unit 731 at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

This photo taken on Sept. 18, 2025 shows the bacteriological incubators on display at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

A visitor sheds tears at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

This photo taken on Sept. 18, 2025 shows teaching materials of Unit 731 on display at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

A visitor takes photos of a board displaying statistics of bacterial production at the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Zhang Tao)

People line up to visit the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Photo by Zhang Dawei/Xinhua)

People visit the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Wang Jianwei)

People visit the Exhibition Hall of Evidence of Crimes Committed by Unit 731 of the Japanese Imperial Army in Harbin, capital of northeast China's Heilongjiang Province, Sept. 18, 2025. "The real history is far more brutal than what the film can depict," said Jin Chengmin, curator of the Exhibition Hall of Evidence of Crime Committed by Unit 731 of the Japanese Imperial Army.

Unit 731, a top-secret biological and chemical warfare research base, was established in the Pingfang District of Harbin, and served as the nerve center for Japanese biological warfare in China and Southeast Asia during World War II.

Historical records suggest that between 1940 and 1945, at least 3,000 people were used in human experiments by Unit 731, while more than 300,000 people in China were killed by Japan's biological weapons. (Xinhua/Wang Song)