RMB7HH3J–A photograph on display at Trinity Site, New Mexico showing the world's first atomic explosion on July 16, 1945. RMB7GBTX–A photograph on display at Trinity Site, New Mexico showing the world's first atomic explosion on July 16, 1945. RMC6XB7A–A photograph on display at Trinity Site in New Mexico shows the first nuclear device explosion in 1945.