SMS Undine was an Imperial German light cruiser of the Gazelle Class, 105 meters long and was built in Kiel in 1902. Undine was used in the Naval warfare of World War I and was part of the German High Seas Fleet.
Undine's job was to protect transport of iron ore between Sweden and Germany. Both Russians and the English were annoyed by the exchange between the two countries. The British sent a submarine flotilla to the Baltic sea to stop the trade.
On 7 November, 1915, Undine was on patrol in the Baltic Sea with two other destroyers when she was brought up by the English submarine HMS E19 which was able to sink her using two torpedoes. It now lies on the bottom of the Baltic sea 20 Nautical miles (40 km) south of Scania, Sweden.