Mussels, starfish and dozens of other creatures great and small travelled across the waters, often on pieces of plastic debris.
Researchers were surprised that so many survived the long crossing, with new species still washing up in 2017.
The study is published in the journal Science.
The powerful earthquake that shook north-eastern Japan in March 2011 triggered a huge tsunami that reached almost 39m in height on the Tōhoku coast of Honshu.



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