Tunnel under the Access to IC24: access tunnel to the airport, with a total length of 403m, including a 3-stage unevenness work under the access to IC24. Top-down solutions with tangent pile walls were used. Tunnel between the kilometers 1+095 and 1+323: this tunnel provides a connection to Verdes Metro Station, and has a total length of 230m, including a strongly skewed unevenness work. Services Provided: Preliminary Study, Draft Project, Final Design and Technical Assistance. Owner: Metro do Porto. Cost Estimate: 5 400 000 €.