One of a total of 60 hydraulic tensioning devices at the junction between the movable and fixed sections of the roof; 18 mm laminated-safety-glass roof (2x8 mm) National Stadium, Warsaw architects: gmp, JSK Architekci; structural planning; sbp; general planners: Alpine Bau Deutschland, Hydrobudowa Polska; cable construction: Cimolai, Hightex; membrane construction: Hightex
Image credit: Hightex