Fukushima and Radiation in the Ocean: How much?

On March 11, 2011, a massive earthquake and tsunami struck Japan, triggering the Fukushima Dai-ichi nuclear disaster. Over 100,000 people were displaced, and millions of gallons of radioactive water entered the Pacific Ocean—making it the largest accidental ocean release of radioactivity in history. This interactive explores how much radiation entered the ocean, how it spread, and what it means for marine life, seafood safety, and human health. Learn how levels have changed over time, how they compare to past events, and what scientists are still studying. Explore the data and separate fact from fear about ocean radioactivity.