The submerged passage is over 1,000 m long; the water, 30 m deep in 1976, is now only 7.
Japan's longest cave with submerged stalactites: the formations took shape before the whole cave flooded. Discovered by a diving club in 1976 (over 500 m in the submerged part alone), it is now 7 metres deep, compared with the original 30, thanks to drainage work. Since 2019 it has offered diving and snorkelling experiences in Japan's first submerged cave equipped for them.
In Bungo-Ōno, the Inazumi cave is Japan's most extensive cavity with submerged stalactites: the limestone formations were created in a dry environment and later submerged by water. It was first explored in the spring of 1976 by a diving club from Saiki, which surveyed over 500 metres in the submerged part alone; development began in the summer of the same year, with scientific surveys until autumn 1977. After renovation it reopened in August 2005. The water depth, once 30 metres, is now only 7 metres thanks to drainage work; surveys in 2014 confirmed over 800 metres of submerged passages with branches, for a total length of over 1,000 metres. Since March 2019 the cave has offered the first diving/snorkelling experiences in a submerged cave in Japan. In January 2021 it appeared in the opening sequence of the anime Sazae-san.
ℹ️ Open 9:00–17:00, with extended hours in summer, all year round. Ticket: 1,200 yen for adults, 1,000 for university students, 800 for junior high and high school students, 600 for elementary school children. It is about 20 minutes by car from JR Mie Station and about 15 km from the centre of Mie.
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