Synopsis

The undersea pedestrian tunnel, a straight and unremarkable 780 meters beneath the Kanmon Straits in southwestern Japan, consistently draws visitors. While many utilize it for practical passage between Fukuoka and Yamaguchi Prefectures, others seek a more personal connection to the submerged passage. The clientele is varied: a young woman revisiting a place steeped in childhood memories with her boyfriend, a man utilizing the tunnel for clandestine marathon training, or a woman who maintains a w