 The Committee that selected the Opera as the winner complimented the design of the roof and the use of bridge construction principles.These principles provide strength, stability and stiffness to the 43-metre-long roof all the way from the columns of the foyer to the furthest corner of the roof.Ramboll were the structural engineers for the new Tate Modern extension, opened on 17 June 2016 in London, the world's most visited museum of modern art.