is a tunnel on JR East-Joetsu Shinkansen line in Japan that runs from Nakazato-cho, Takasaki city to Kawashima, Shibukawa city, in Gunma prefecture with approximate length of 15.350 km. It was completed and opened in 1981.Haruna Tunnel 30 meter hole in the ground, 11 families evacuated, landslide 75 meters underground "Asahi Shimbun" 1978 (Showa 53) July 18 morning edition, 13th edition, page 7
Excavation was extremely difficult due to the poor geology consisting of volcanic mud flow sediments and water inflow reaching a maximum of 110 t/min, so injection, two-stage silot, and pressurization methods were used in combination. The discharge of tunnel water also affected the ground surface, causing a decrease and depletion of well water, irrigation water, and surface water.「上越新幹線工事誌 大宮・水上間」昭和58年10月 In addition, on July 20, 1978, a 30-meter-wide cave-in occurred in the Yamakoda area of Haibuto-Mura. The fields and the Arai-Shimomurota line of Gunma Prefectural Road No. 154 were engulfed, and a large amount of earth and sand flowed into the tunnel directly below (Shimo-Arai construction area).トンネル 地面のむ 30メートルの穴 11世帯避難 地下75メートルで土砂崩壊『朝日新聞』1978年（昭和53年）7月18日朝刊、13版、7面
See also List of tunnels in Japan Seikan Tunnel Tappi Shakō Line Sakhalin–Hokkaido Tunnel Bohai Strait tunnel
References
External links Gov. maps.gsi.go.jp Mapion maps Haruna Tunnel (in Japanese)