TOKYO, March 9: When a huge earthquake and tsunami struck Japan on March 11, 2011, devastating towns and triggering nuclear meltdowns in Fukushima, a stunned world watched the chaotic struggle to contain the world’s worst nuclear disaster since Chernobyl.

An onslaught of waves sparked by the 9.0-magnitude quake crashed into the northeastern coast, killing nearly 20,000 people and crippling the Fukushima Dai-ichi plant. More than 160,000 residents fled as radiation spewed into the air.