From the 1,224km Nord Stream pipeline carrying Russian natural gas to Europe vto the 166km Langeled gas pipeline running under the North Sea, offshore-technology.com profiles the world's ten longest oil/gas subsea pipelines. Nord Stream, Baltic Sea The Nord Stream, a 48-inch diameter twin pipeline system runs for 1,224km through the Baltic Sea from Vyborg, Russia, to the German coast near Greifswald transporting Russian natural gas to Europe.