City in the Arctic was Otto’s visionary proposal to house 40,000 residents within an air-supported city dome in Antarctica. Created with engineers at Arup in 1971, the pneumatic dome stretches 2 kilometers across and would be built on an estuary for easy access to shipping routes. A nuclear power station would provide heat and energy to the dome and would help keep the harbor ice-free. The proposed canopy would be constructed from a translucent skin attached by a grid of high-strength polyester fiber cables.