OSAKA -- A 2.2-km undersea tunnel for trains and vehicles linking Sakishima, a man-made island in Suminoe Ward, and Tempozan, in Minato Ward, was opened to road traffic Oct. 17.The tunnel is intended to provide easier access to the waterfront development district from the city center, local officials said.A 3.7-km tram line extension, part of which runs through the Osaka Port-Sakishima Tunnel, opens Oct. 18. The section connects Osaka-ko Station on the Chuo subway line with Naka Futo Station on the New Tram Line. The two transportation systems are linked at Cosmo Square Station on the man-made island.The New Tram Line will stop operations Oct. 19 for test runs on the extended section. Bus service will instead be provided during the day to transport passengers between Suminoe Koen and Naka Futo in Suminoe Ward. The normal fare for a car to pass through the tunnel is 200 yen.