Core Viewpoint - The article emphasizes the importance of the 731 Unit Evidence Exhibition Hall in revealing historical truths about Japan's biological warfare during the invasion of China, marking its 40th anniversary and the 10th anniversary of the new hall's opening in 2025 [5][6]. Group 1: Historical Context - The 731 Unit was established by the Japanese army in Harbin in 1933 to secretly develop biological weapons and conduct inhumane human experiments, which were part of a state-organized crime against humanity [5][6]. - After Japan's defeat in 1945, efforts were made to cover up the crimes of the 731 Unit, but archaeological surveys and academic research have gradually uncovered the truth [5][6]. Group 2: Exhibition Hall Achievements - The 731 Unit Evidence Exhibition Hall opened on August 15, 1985, and has since focused on collecting evidence of Japan's biological warfare crimes, gathering over 190 testimonies from laborers and thousands of artifacts [6][7]. - The new hall, opened in 2015, spans 250,000 square meters and has become an internationally influential memorial for World War II atrocities, featuring a systematic exhibition that reveals the crimes of the Japanese army through various artifacts and historical documents [7][9]. Group 3: Key Artifacts - Two significant artifacts include a military sword gifted to a member of the 731 Unit involved in live dissections, which serves as direct evidence of the unit's atrocities, and a registry of 3,497 unit members, providing crucial insights into the structure and scale of the 731 Unit [8][9]. - The exhibition design effectively conveys the gravity of the historical events, using multimedia elements to create an immersive experience for visitors [9]. Group 4: Future Aspirations - The authenticity and integrity of the 731 Unit evidence site meet the criteria for World Cultural Heritage status, and the hall is actively pursuing its application for recognition as a World Memory Register, reflecting its commitment to preserving historical truth and promoting peace [9].