One of the ways that the EU is dealing with the refugee crisis is to launch a naval mission, called "Operation Sophia." Its primary mission is to track down people-smugglers, and destroy their boats. But the ships that take part in the mission also rescue a lot of refugees on the high seas -- 12,000 since early 2015, in fact. 14 states are taking part in the operation. Germany has sent a corvette and a supply ship. Our reporter meets an officer cadet who's serving on board the supply ship, the "Frankfurt am Main," and shows us how the crew are dealing with their new mission.