On the 20th, a diving survey at the Inazumi underwater cave in Oita Prefecture was conducted, revealing a maximum depth of 97.4 meters. This measurement sets a new record, identifying it as the deepest water level that humans can access in an underwater cave in Japan. The cave, known for being one of the largest underwater caves in the nation, was previously established to be the longest at around one kilometer in length.

The diving operation was led by a team from the diving shop "Cave Explorers Inazumi," with diver Yuji Ohama at the forefront of the measurement effort. Utilizing specialized equipment, the team dove into the cave to accurately gauge the depths. The underwater exploration of the cave showcases not only its remarkable aquatic features but also emphasizes the need for further scientific investigation into its unexplored areas.

This discovery bears significant implications for environmental research and tourism in Oita Prefecture, as the depth of the underwater cave adds to its allure for adventurous divers and researchers alike. It highlights the natural beauty and geological formations present in Japan, encouraging both local interest and international attention towards this unique underwater site.