Part 2/10:

Starting at just 10 to 15 centimeters below ground level, Philadelphia’s infrastructure begins. The city’s surface is paved with asphalt, concrete, and paving stones, which provide the base layer for its roadways and pathways. As we delve deeper—up to 3 meters (around 10 feet)—the complexity of Philadelphia’s utilities emerges. Telephone lines, electrical cables, gas pipes, and rainwater drainage systems crisscross beneath the city, ensuring its functionality.