Zaha Hadid designed the London Aquatics Centre for the 2012 Summer Olympics. Its sweeping roof encloses three pools and was designed to accommodate 17,500 spectators during the Olympics and 2,000 after in legacy mode. Structurally, the roof is supported at three points and the opening between the roof and podium housed additional seating during the Olympics, later infilled with glass. The Aquatics Centre layout aligned the three pools on an axis perpendicular to a nearby bridge with the training pool under the bridge and competition and diving pools within the large enclosed pool hall.