An underwater city
The first underwater city is built near Rabat (in the Atlantic Ocean) in 2040. The city is named after Jacques-Yves Cousteau. The majority of the city’s population is scientists and engineers. They have two important goals. The first is to find a way out of the phosphate crisis by exploring underwater mineral deposits. The second is to carry out experiments and see whether it is possible for a human to comfortably live and thrive underwater.
At first, many adventurers flock to the city, hoping to turn a new page in the history of humankind. They come from all over the world and call themselves “new Atlasses.” Soon, however, the hype wears off and the search for a solution to the phosphate problem moves into space. The underwater city goes into decline.
By 2050, the government stops all research programs in the city and focuses on creating recreational and medical facilities instead. Now, people with allergies or serious respiratory diseases will be able to treat their illnesses there. The main advantages of such a place are its enclosed air circulation system and unique programs that can control the contents and pressure of the air using plankton. This gives a chance to many people who suffer from the worsening ecology on land.