The Polish navy says it is almost certain that it has located the wreck of Nazi Germany's only aircraft carrier, the Graf Zeppelin. A Polish firm searching for oil first detected the wreck in the Baltic Sea, 55km (34 miles) offshore. The ship's whereabouts had been a mystery since the end of World War II. The navy investigated and said it was 99% certain that the wreck was the Graf Zeppelin. The ship, built in 1938, never saw action in the war. The navy said it was unlikely that the 250-metre (820-foot) wreck would be recovered from the seabed, as...