Artists perform during a show directed by German director, Volker Hesse, at the opening day of the Gotthard Base Tunnel, the longest tunnel in the world, at the Rynaecht fairground at the northern portal in Erstfeld, Switzerland, 01 June 2016. The construction of the 57-kilometre long tunnel began in 1999, but the breakthrough was in 2010. After the official opening on 01 June, the commercial operation will start in December 2016. EPA/ALEXANDRA WEY
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