New 'ballast-free ship' could cut costs while blocking aquatic invaders

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Workers lower a scale model of a Great Lakes bulk carrier into the towing tank at the U-M Marine Hydrodynamics Laboratory.
Workers lower a scale model of a Great Lakes bulk carrier into the towing tank at the U-M Marine Hydrodynamics Laboratory.

University of Michigan researchers are investigating a radical new design for cargo ships that would eliminate ballast tanks, the water-filled compartments that enable non-native creatures to sneak into the Great Lakes from overseas.


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