Japanese ship designers said they have conceived a non-ballasted watercraft (NOBS) to prevent environmental pollution caused by the discharge of harmful substances from ballast watercraft in the past. At present, the technology is only applied to ships such as the giant tanker VLCC and Suez, while the bulk carrier and container ships are still in the development stage.

The designer stated that NOBS allowed the vessel to sail without ballast water by expanding the width of the vessel and the fully sunken propeller. On the other hand, only a few shipyards around the world are able to build non-ballasted watercraft, and some ports cannot accommodate large vessels such as NOBS.

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