October 2021 - IBB President approved for the IMM to make external borrowing of the line; July 2021 - Construction underway; August 2018 - Contract rewarded to Cengiz - Alsim Alarko JV after it was cancelled in January 2018; Construction commenced in April 2017; Line will start from last station of Kadikoy-Kartal-Kaynarca metro line and end in Tuzla