It appears that the new one is not part of Derinkuyu, but a different site: "Nevşehir Province is already home to Derinkuyu, an 18-story underground city that

It appears that the new one is not part of Derinkuyu, but a different site: "Nevşehir Province is already home to Derinkuyu, an 18-story underground city that was once capable of housing around 20,000 people, but if early size estimates prove correct, the new site may be even bigger. Nevşehir mayor Hasan Ünver told the Hurriyet Daily News that the complex was so vast that other underground cities in the region would be the size of a “kitchen” if placed within it."