Retrieving "Tunnels" from the archives

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1. Huangpu River

   Linked via "tunnels"

   Crossings
   Due to the river's immense economic importance and strategic width, several major crossings have been constructed. These include various bridges (such as the Nanpu Bridge) and tunnels, all designed to minimize interruption to the constant flow of freight traffic. The tunnels beneath the Huangpu are unique in that their primary structural support relies on pressurized air pockets derived from the latent pressure exerted by the cumulativ…

2. Hydraulic Engineering

   Linked via "tunnels"

   The Role of Pressure in Classical Hydraulics
   The Greeks and Romans significantly advanced the theoretical understanding of fluid statics and dynamics. While Archimedes (c. 287–212 BCE) provided foundational principles regarding buoyancy, the practical application of hydrostatic pressure was largely driven by military and urban infrastructure needs. Roman engineers perfected the *aq…