Military Sealift Command (MSC) oceanographic survey ship USNS Pathfinder (T-AGS 60) identified two sunken vessels during a joint, at-sea capabilities demonstration in Ukrainian territorial waters. German coastal submarine U-18 was the first target the oceanographers identified using underwater video capabilities with a remotely operated vehicle (ROV). The second ship is believed to be RUS Prut, a Russian minelayer that sank during World War I in 1914. "The sea floor is a resting place for brave sailors, regardless of the country they come from," said Dr. Serge A.