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Halkalı Istanbul Airport Metro Project Main Contractor : Yedigöze İnş.Dan.Otom. İç.ve Dış Tic. Ltd.Şti.Scope of Özsöz : TBM operation between Olimpiyatköy - FenertepeLine Length : 15.176 m (Double Line total)Number of TBM : 2Excavation Diameter : 6570 mmSegment Length : 1,50 mSegment Outer Diameter : 6300 mmSegment Inner Diameter : 5700