First welding for Ataköy - İkitelli subway tunnel by İstanbul Mayor Ekrem İmamoğlu. 13,5 kilometre long tunnel. It will partially open in 2021 and fully for all 11 stations ready in first quarter of 2022 announced mayor.

İstanbul is Türkiye's biggest city.

https://www.cumhuriyet.com.tr/haber/ekrem-imamoglu-duyurdu-istanbullulara-yeni-metro-mujdesi-1740045