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One London-based designer named Phil Pauley has been working for the past two decades to design and develop a full city concept which will be located underwater. With overpopulation and rapidly decreasing available land space, innovative ideas are needed for exploring where and how we'll live in the future. That's where one London-based designer named Phil Pauley comes in. He has been working for the past two decades to design and develop a full city which will be located underwater. Called Sub-Biosphere 2, it is basically a string of structures that are self-sustainable. The project will be able to provide shelter for about 100 people.