Moguranpia, Underground public aquarium in Kuji, Japan
Moguranpia is a public aquarium in Kuji, built inside former underground oil storage tanks carved into the rock. The tunnels and caverns have been converted into display spaces where fish and other sea creatures from the nearby Pacific coast are kept in large tanks.
The underground chambers were originally built to store crude oil and had no connection to the sea. After the 2011 earthquake, the aquarium moved temporarily near Kuji Station before returning to its original location with support from local residents.
Inside the aquarium, ama divers give live demonstrations of breath-hold diving, a tradition practiced by women along this coast for centuries. Watching them work without any modern equipment gives a clear sense of how closely the local community has always lived with the sea.
The entrance is a short walk from central Kuji, and the site is reachable on foot from the train station. Because the exhibition spaces are underground, the temperature inside stays cool year-round, so a light layer is worth bringing.
The aquarium is one of the very few in the world that sits entirely underground using repurposed industrial infrastructure. The name Moguranpia comes from the Japanese word "moguru," meaning to dive or burrow, which reflects the experience of going down into the rock to see the exhibits.
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