What are the features of sustainable floating city prototype to be built in S Korea?

The world's first sustainable floating city prototype will be built off the coast of South Korea's Busan by 2025, which will be a collection of hexagonal platforms perched on top of water. The UN-backed city could resist a category-five hurricane and its human-made islands will rise with the sea to avoid flooding. It'll be self-sufficient in food, energy and water.