The roof, which has a surface area of 214,500 square feet, consists of two giant arcs at either end of the venue, each with a span of more than 1,000 feet, and a height of 264 feet. These arcs will provide support for the cables holding the plexiglass panels that make up the roof.
The panels, which cover 95% of the seats, will help reflect sunlight, an important function considering temperatures in Athens can reach 104°F during the summer.
The 16,000-ton glass and steel dome over the main stadium, which seats nearly 75,000 people, was designed by Spanish architect Santiago Calatrava.