PRINCIPLE The advantage of the Dry Dock is to be able to perform a clean careening at sea, in respect to the European laws and regulations. Extract from the law of the third of January 192: ''The harbor's responsibility is engaged in waste management, the polluter will have to pay for the damage, it means the harbor, the ship builder etc ...'' Considering that each time a boat is cleaned or careened, the water charges itself in all sorts of solid polluted particles like sand, paint, lead, stones, oil, gasoline or grease. In conclusion, it is absolutely necessary to consider and process the contaminated and polluted water directly during the careening process. To be able to send back clean water to the sea, all the water collected on the Dry Dock will be collected in several sedimentation tanks to be treated.