Part 9/11:

Originally designed with potential military purposes in mind, whispers of phantom stations and unexplained phenomena enhance the subway's mystique. Moreover, beyond the subway, depths of 50 meters down reveal an extensive sewer system synonymous with modern urban infrastructure built to handle the city's growing demands.

The Cutting Edge: New Developments

Recent infrastructural ventures include an advanced underground expressway constructed at a depth of 75 meters, designed to alleviate surface-level traffic congestion. This innovative transport project maximizes the use of underground spaces while enhancing interconnectivity between Beijing and its surrounding districts.