Reply on topic: Boring of 2nd Metro Tunnel for New İstanbul Airport (New Atatürk Airport) to start
Dear @Zaka, E=BERK is not using an E-BERK TBM in project. A renovated second hand TBM is used for low cost. E-BERK is a subcontractor here. Main contractor puts constraints on cost and so. In Turkey second hand TBMs cheaply renovated and become tunnel ready again.
cover tunnel photo by: Matt Brown from London, England / CC BY
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