ENVC S.A. is a public limited company wholly publicly owned , governed by the Empordef . ENVC are a shipbuilding and repair of medium-sized company in business since 1944 , located in Viana do Castelo, on the Atlantic coast in the north of Portugal . They occupy an area of 400,000 m2 and employ about 900 workers , the largest shipbuilding Shipyard Portugal . Has built more than 200 vessels of various types : barges , tugs , ferries , fishing vessels , bulk cargo , container , cement carriers, tankers , LPG , chemical carriers and warships .