The passenger ship Mecklenburg suffered water ingress while proceeding on the lower Elbe River.   The Mecklenburg with 23 passengers and three crew was on a trip from Berlin to Schwerin when a crew member discovered the engine room was flooded with water up to his knees.   The master contacted the Wittenberge fire service for assistance.  The fire service hooked up multiple pumps and discharged the water out of the engine room.   The fire service constructed a tempory basin to contain the waste water as oil and diesel fuel.   After serveral hours of pumping water, the leak was discovered to be a faulty valve.   No reports of injury and no pollution was released.