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A view shows a cross-section of a manganese crust at
A view shows a cross-section of a manganese crust at the bottom of the Norwegian Sea, in this undated handout picture. University of Bergen, Centre for Deep Sea Research/Handout via REUTERS
A view shows a cross-section of a manganese crust at the bottom of the Norwegian Sea, in this undated handout picture. University of Bergen, Centre for Deep Sea Research/Handout via REUTERS