#1 of the images Cold Season Exclusive: Explore Kannana Underground’s ‘Regulating Pond’ and Flood Protection Tunnel | FRIDAY DIGITAL

The Kanda River and Loop Route 7 Underground Regulating Pond has a diameter of 12.5 m. The staff member holding out his arms is 170 cm tall, giving a good idea of its size (PHOTO: Kenji Kawato).

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Cold Season Exclusive: Explore Kannana Underground’s ‘Regulating Pond’ and Flood Protection Tunnel

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