"I Was There" is a trilogy of experimental documentary films that explores the problem of radiation, our society's fading collective memory of the atomic bombing of Hiroshima and Nagasaki, and the unresolved debate between ethics and science. These series concern the immediate effects of weaponized nuclear technology, as invisible poison, on the human body. Meditating on the survivor's memories, "I Was There" (Part I) traces the experience of a physician for the past 70 years, who recounted his day as a rare witness when the atomic bomb was dropped in Hiroshima. The poignant and thought-provoking evidence of the secret war tactics reveals the human value during times of war in conflicts. Saving American lives is the commonly known and acceptable narrative of why the United States government dropped the first atomic bomb on Hiroshima. However, this narrative contradicts the finding in personal and petitions letters, and arsenal photography housed at the Truman Presidential Museum. The evidence uncovers a rather surprising reason for testing the atomic bomb on humans – competing for war power against Russia and securing the US dominant role in global politics. For information about the series "I Was There", please visit https://chijangyin.art