The new extension will have a total length of 3.5 km, of which 2.5 km will be the tunnel, while the remaining part will be an extension of Attica Road
https://greekcitytimes.com/2023/05/04/largest-inner-city-tunnel-greece/
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://greekcitytimes.com/2023/05/04/largest-inner-city-tunnel-greece/