From 1974 to 1990 Kumamoto Prefecture sealed about 1.5 million cubic metres of Minamata Bay sediment above 25 ppm mercury under a 58-hectare landfill that cost 48 billion yen - Space Daily
SpacedailySeptember 13, 2026

Stand on the eastern shore of Minamata Bay today and part of the ground underfoot is manufactured: 58 hectares of reclaimed land, capped with mountain soil, holding down sediment that was too poisono…
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