Ethniki Amyna (Εθνική Άμυνα) is an Attiko Metro Blue Line (Line 3) station, situated close to the Hellenic Ministry of Defence (Υπουργείο Εθνικής Αμύνης), and the Hellenic Ministry of Transportation and Communications. When the Metro first opened, it served as the terminal station for all trains to that direction ("Syntagma" station, being the other end of the line at the time). The Athens Metro is the underground public transport system of Athens, Greece, constructed by the Attiko Metro (Αττικό Μετρό) company (literally Attican metro). History Construction began in 1996 to decrease traffic congestion and clean up the enviromnent by reducing Athens smog level. ... The Syntagma (Σύνταγμα), the Constitution of Greece is resolved by the Fifth Revisionary Parliament of the Hellenes and entered into force in 1975. ...