In the summer of 1966 the original floodlights were replaced by much taller floodlight pylons. Bands and displays were included and shows were often conducted by floodlight or searchlight. A floodlight is a broad-beamed, high-intensity artificial light. A submersible camera with a floodlight was deployed to record images below the surface. A new Football League standard floodlight system and perimeter fencing were also installed. A "Pittsburgh Post-Gazette" story in 1970 stated that the new stadium boasted 1,632 floodlight bulbs. The roof has an integrated floodlight design and is designed to provide superior acoustics. The entire field is lit with a floodlight system. The pitch is also heated, and lit with a floodlight system. They were upgraded in 1957, and in 1961, floodlight pylons were installed. With the three stands completed, the ground was now suited to a floodlight installation. The fourth and final floodlight tower in the south-east corner still stands, awaiting its removal. In November 1966, a new floodlight system was installed at the Olympic Stadium. They were fitted with a 7.62mm MG (M60?) with a ballistic shield and a floodlight. It has floodlight, but no Under-soil heating.