The M11 is entirely underground, making it the second longest continuous subway tunnel in Europe, behind the Moscow Metro's Bolshaya Koltsevaya line.

[4] The line will run through six districts of Istanbul, Şişli, Kağıthane, Eyüpsultan, Arnavutköy, Başakşehir and Küçükçekmece.

The Turkish construction consortium Kolin-Şenbay won the tender for the building of the metro line in December 2016.

[4] The line is being constructed in four sections: The rolling stock was manufactured by CRRC Zhuzhou Locomotive, the first 120 km/h (75 mph) class automated metro train exported by China.

On 3 January 2024 the Minister of Transport and Infrastructure, Abdulkadir Uraloğlu announced that 15 automated trainsets were ready to enter into use.