The Santa Apolónia and Terreiro do Paço metro stations opened to the public on December 19, 2007, offering full accessibility for passengers with reduced mobility through elevators and escalators that provide access to the platforms.

The project was awarded to SISTAVAC in August 2007, with the goal of completion before Christmas of the same year, and had a duration of 5.5 months. The scope included the installation of ventilation and smoke extraction systems, as well as centralized management and control of ventilation, ensuring safety and comfort conditions for users.