Preliminary design for the tender of – Lot 1: Construction of a tunnel between PK 0+000 and PK 1+313.429, from the end of Rato Station to the north diaphragm wall of Santos Station; – Lot 2: Construction of a tunnel between PK 1+313.429 and PK 1+985.292, from Santos Station to the end of Cais do Sodré Station. Developed in consortium with INTECSA-INARS