TECHNICAL SPECIFICATIONS Owner: EYDE/A.O.E.E.- General Secretariat of Sports of the Greek Ministry of CultureArchitect: Santiago CalatravaGen. Contractor: JV Aktor/Athena/ThemeliodomiCapacity: 71,000 seatsDescription: tubular double arch spanning approximately 300 m and supporting the roof structure (shaped plate girders, including main & secondary cable stays). The roof was constructed outside the stadium before being slid over the stands.