Huge underground city found in Mexico?

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(BBC) Hidden mere meters under Mexico's modern capital, a series of temples, royal palaces, and mysterious artifacts from an ancient kingdom are being unearthed.

As we descended 7 meters (21 feet) below Mexico City’s Metropolitan Cathedral, I could feel my heart race. I had heard whisperings about the temples buried under this iconic cathedral – one of the largest and oldest in Latin America ­– but since their discovery in the 1970s, it had not been possible to see them.

We the Mexica [of Mexico] are not "Aztecs"

Now, I was part of a public tour that lets visitors explore the ancient secrets that lie just below this [Catholic] church’s depths.

Nearly 500 years after Spanish Conquistador Hernán Cortés toppled the Aztec capital of Tenochtitlán [the "Place of Nopal Cactuses"], the remains of the ancient metropolis continue to lay hidden mere meters under modern-day Mexico City.

The Spanish [invaders from Spain] started building the Metropolitan [Catholic] Cathedral in 1573 above on top of the sacred Aztec (the “Mexica” as they called themselves) temples as a symbol of conquest. More

• Mexico City’s secret underground world (BBC)
• A long-lost city found in the Americas (BBC)