The world's busiest airport, Singapore's Changi airport's newest terminal, its fourth, officially began operations recently, which features cleaning robots, mechanised systems transporting luggage, and a live theatre production. This Singapore airport unveiled a £544 million (₹4,660 crore) five-storey terminal the size of 27 football fields. It has not completed construction yet, and will get a rainforest-inspired canopy garden housing the world's biggest indoor waterfall by 2019.