An iron cage about the weight of 150 elephants is set to be hoisted 400ft above the ground off Science City. There, the 600-tonne structure will hang between two 38-storey residential blocks and house a club, complete with mini greens, swimming pools, squash courts and party pads. The project called Atmosphere was launched four years ago on a three-acre plot on EM Bypass. It comprises two towers, 500ft high and 165ft apart from each other. They will have 80 apartments, priced between Rs 10 crore and Rs 22 crore. On Wednesday, engineers will start from dawn to haul up by dusk what has been the biggest talking point of the project, the sky club.