Why is bikini atoll uninhabitable?

Bikini Atoll is uninhabitable primarily due to extensive nuclear testing conducted by the United States between 1946 and 1958, which left the area contaminated with radioactive materials. The tests resulted in significant environmental damage and long-lasting radiation that poses health risks to humans and wildlife. Although some cleanup efforts have been made, the radiation levels remain too high to safely support a permanent population. Consequently, the atoll is largely abandoned and designated as a site for research and monitoring of radiation effects.