In the run-up to the track and field competitions, the London Olympic Stadium is back to its original state, with the red Mondotrack once again at the heart of the all the action ready to start with the arrival of the athletes. One of the most delicate operations during the 80 hours of work required to dismantle the huge stage created for the Opening Ceremony was moving the Olympic cauldron to the south end of the stadium. During the transition, the flame was placed in a special miners' lantern overnight. The cauldron was then relit with the Olympic Torch by one of the London 1948 torch-bearers, Austin Playfoot. The structure, designed by Thomas Heatherwick, is 8.5m high and is made up of 204 steel pipes and as many individually designed copper petals inscribed with the names of the London 2012 competing nations. At the end of the Games, each team will have its petal and the cauldron will cease to exist.