The Underwater Road Tunnel Salamina island - Perama is a planned sub-sea road tunnel in the Attica region of Greece, which will provide a direct road link between the island of Salamis of Islands Regional unit in the Saronic Gulf and the port city of Perama in Piraeus Regional Unit, on the east coast of the Saronic Gulf. In whole, the project includes the construction of an underwater road tunnel about 1 km long, the construction of a new road section from Schistos Avenue to the tunnel's entrance in Perama, as well as two new interchanges connecting the adjacent road network in Salamis and Perama.