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Currently you are able to watch "The Underwater City" streaming on Tubi TV for free with ads or buy it as download on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu. It is also possible to rent "The Underwater City" on Apple TV, Amazon Video, Google Play Movies, YouTube, Vudu online
An engineer, a psychologist and several other disparate types take part in an experiment to see if people can live for extended periods of time in a city built under the ocean.