Part 2/11:
As we begin our exploration, we first consider what lies just below the surface of this vibrant metropolis. Beneath the London's paved walkways and roads, various layers compose the foundation of the city. At a thickness of 5 to 10 cm, we're greeted by the paving stones, followed by 20 cm of soil. Electric cables, gas pipelines, and various other infrastructures, all neatly embedded beneath sidewalks and thoroughfares, further illustrate the complexity of London's underground world.