Today ship need to take ballast onboard when they are crossing an ocean in light draft. Light draft can be du to high volume cargoes with low weight or the ship is empty. Another reason to take onboard ballast could be light cargo in the cargo hold
and heavy cargo on deck in order to obtain positive stability. Todays ships use water as ballast Sea water or fresh water pending where ship load the ballast. This water contain microorganism, small fish and crabs. Upon arriving loading place this water ballast
must be pumped overboard io to give displacement for the new cargo. Ships are today supposed to filter, heat or kill as much as possible of these unwanted “blind passengers” but that is difficult, but most of all very costly and it takes a lot
of energy, energy that are generated from diesel engine that pollute the air enormously. Ceobas however is constructed in a way that when increased draft is needed the ship crew can only pus a button and instantly the ships displacement is being reduced.
The “ballast” water now simply flow through as the ship stem the water. See how this work by pushing the animation button.