The Sun in Kurobe (2009)

Shingo Katori stars as Kuramatsu, a manager- foreman for Kumagaya Construction. In order to solve an acute energy shortage in the Kansai region, Kansai Electric Power decided to built a massive hydroelectric dam on the upper Kurobe River. However, the project requires the drilling of a huge tunnel that some, including Kuramatsu, believe is impossible.