Until 2006, when the project was halted, the work had been assigned to a consortium of Italy's Impregilo, Condotte d'Acqua, Cooperativa Muratori & Cementisti (CMC), and Consorzio Stabile A.C.I., alongside Spain's Sacyr, and Japan's Ishikawajima-Harima Heavy Industries.
Fram till 2006, när projektet stoppades, hade arbetena tilldelats ett konsortium av Italiens Impreglio, Condotte d'Acqua, Cooperativa Muratori & Cementisti (CMC) och Consorzio Stabile ACI, tillsammans med spanska Sacyr Vallehermoso och japanska Ishikawajima-Harima Heavy Industries.