CALAIS - FRANCE - 20 May 2015 -- In October 2015 a French ship will start laying a 1200 km long subsea optical cable from Helsinki to Rostock Germany. - The 100 million Euro subsea optical cable is produced in the Alcatel-Lucent cable factory, which is the largest in the world. Tour of the factory with a world map of existing subsea optical cable network. -- PHOTO: Juha ROININEN / EUP-IMAGES