The Chernobyl nuclear disaster occurred on April 26, 1986, in the Soviet Union, leading to one of the worst nuclear accidents in history and significant changes in nuclear safety protocols worldwide.

On April 26, 1977, the first Star Wars film was released, revolutionizing the sci-fi genre and becoming a cultural phenomenon that influenced films and fandom for decades.

On April 26, 1954, the first atomic-powered submarine, USS Nautilus, was launched by the United States, marking a significant advancement in naval engineering and military capabilities.