The Athens Metro is the underground public transport system of Athens, Greece, constructed by the Attiko Metro (Αττικό Μετρό) company (literally 'Attican metro').
Construction began in 1996 to decrease traffic congestion and clean up the enviromnent by reducing Athens' smog level.
Unfortunately in 1997, The line which became the stations between Syntagma and Panepistemiou, 24 m deep, there was a big hole 5 m wide. This had affected the subway construction fearing the Panepistemiou (University) Avenue and the tunnel would collapse. Construction went on hold. Later in the afternoon, cement trucks were filling the hole with concrete so the ground could become more stable and not to collapse which would result in monthly closure of the avenue and the subway project. After the hole was entirely filled, construction was back in progress.
List of stations of the Athens metro system
List of stations in Line 2 (the red line)
Aghios Antonios - The current north end of the line.
Sepolia
Attiki near the train station
Larisa, near the train station
Metaxourgio NE of Omonoia Square
Omonoia - featuring Omonoia Square, it connects also with the ISAP Metro Line 1.
The idea for a metro was first perceived in the 1950s, and the plans called for an underground line starting from the main Athens railway station (Larissa Station) to Syntagma, where it would fork into two branches, one to Faliro and Glyfada and the other to Ambelokipi.
A basic question asked about Athens metro is how the construction of such a large project would not affect the city's vivid historic nature, as it is taking place in the most interesting locations of classical times.
Metro was making news all throughout October 1997, when viewers experienced, during a regular live transmision, the unexpected disappearing of a news-stand into the ground.