The ground is shifting under Iran’s capital, Tehran, home to approximately 15 million people and the biggest city by population in western Asia. High-resolution satellite images recently revealed that in some places, the metropolis of the Middle East is sinking about 10 inches (25 centimeters) per year. A side effect of such impressive subsidence is the sudden appearance of giant cracks and sinkholes in some areas that may end swallowing up Tehran underground within the next decades.

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