A quarter of the 10,500 m² membrane comprising the movable inner roof prior to the heat-sealing of the four sections on the cable structure 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