Donbass Arena ( ; is a stadium with a natural grass pitch in Donetsk, Ukraine, that opened on 29 August 2009. The facility is located in the center of the city, in the Lenin Comsomol park. With a capacity of 52,187 spectators, the stadium used to host FC Shakhtar Donetsk matches and also hosted some matches of Euro 2012. The final cost of construction for Donbass Arena was $400M. The stadium has been unused and closed to the public since May 2014, due to the War in Donbas. The name of the stadium represents the simplified and shortened name of the Donets Basinhuge industrial region of Donbas, henceDonbas (Ukrainian: Донецький басейн or Донбас). Construction and design Construction began in 2006. The general contractor was a Turkish company ENKA. The Stadium was completed and opened in 2009. About 1,600 specialists, mainly Turkish, were involved in the construction. Donbass Arena was designed by ArupSport. It was Project Managed by Arup Major Projects (Project Director Charles Goddard). Arup Sport also designed the City of Manchester Stadium (Manchester, England), Allianz Arena (Munich, Germany) and the Beijing National Stadium (Beijing, China). The soaring roof effect makes the Stadium resemble a flying saucer. The stadium has an oval shape and a glazed façade and is located near Regional Sport Complex Olimpiyskiy. The roof of the stadium slopes from north to south matching the landscape and contributing to the natural lighting and airing of the pitch. The external lighting makes the Stadium shine at night. A major design consideration was the ongoing protection of as much of the forest setting as possible (each tree having been planted in commemoration of deceased family members in the Great Patriotic War, and the exclusion zones to the neighbouring war memorials. A major geotechnical fault exists some 100m below the ground directly under the centre-spot. The building's foundations and piling was a major sub-project. Opening The Donbass Arena was completed ahead of schedule, but the grand opening was delayed until 29 August 2009 to coincide with the Ukrainian holiday of Miners Day, as well as Donetsk City day. Donetsk is in the Donbas region, a mining region, and the date was chosen for its symbolism. The primary tenant of the facility is the local professional football club Shakhtar Donetsk ("Donetsk Coal Miners"). American Pop/R&B singer-songwriter Beyoncé Knowles performed a show from her I Am... World Tour on the opening night of