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Two scientists claim to have found a way to the underground metropolis, visited it, and even recreated what they saw on paper to the smallest detail! Do you believe it or not? Don't answer until you see their sketches with your own eyes! Colour in the work of famous researchers! After many days of colouring, you'll feel like you're at home underground. Walk along the multi-storey streets, look into open houses, and spy on the quirky inhabitants. They are just like people... Well, almost!