Just wanted to say this is not something particularly special to the Chinese. For example in Sweden they build the (cold war) airbases around the country underg

Just wanted to say this is not something particularly special to the Chinese. For example in Sweden they build the (cold war) airbases around the country underground. They would use regular roads (that were widened in particular places) as runways. You can visit one of those near Gothenburg: https://www.guidebook-sweden.com/en/guidebook/destination/aeroseum-air-force-museum-gothenburg https://www.guidebook-sweden.com/en/guidebook/destination/ae...