Part 2/11:
The journey beneath the streets of Mexico City begins with its foundational layers. At a mere 5 to 20 cm below ground lies the asphalt or concrete road surface. Beneath that lies gravel, laid to ensure stability and drainage. Further down, the layers comprise communication cables and utility lines, intricate products of modern urbanization, reflecting the city's evolution over time. As we descend deeper, to about 1.5 meters, we uncover ancient tombs, some dating back 3,000 years, a captivating juxtaposition of past and present.