Maliakos Gulf Crossing project included an 4 km Immersed tube tunnel, that was to be constructed and operated under a D.B.F.O.T. scheme. Doxiadis Associates through its affiliated company Metrotech S.A. provided Technical Consultancy Services to the Greek State in cooperation with large European Firms. The Services provided included Design Review and Evaluation; Traffic Data Evaluation; Preparation of the Tender Documents including the Concession Agreement; Technical Evaluation of Bidders ; Determination of the Operation and Maintenance Procedures