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Abstract: A sudden water inrush occurred along with fuel from the old / unused underground storage tanks of a fuel-station through one of the forepooling drills and thus, construction of the double- tube NATM tunnels with 30 m bench cross-section was stopped on 12 June 2015 in Uskudar - Umraniye - Cekmekoy Metro Project. The risks and safety precautions for re-starting the construction, are summarized....