New underground metro connection between Moyua, Rekalde and Irala linking southern residential areas with Bilbao city centre. Includes cavern-style stations like Zabalburu, acting as an extension of L ACS Group · Acciona · News
Bilbao Metro Line 4 (Matiko–Alonsotegi) is a metro project in Spain, currently approved.
Greenfield new corridor: new metro extension on new underground alignment.
Construction began in 2027, with completion expected in 2033.
The project has an estimated investment of €412M.