Most engineering marvels, such as bridges and skyscrapers, are plain to see, but underwater tunnels are far more elusive. These tunnels, which bridge gaps between cities, states, countries, and continents, run far beneath oceans and rivers, connecting us all. Underwater tunnels are built using tunneling shields, tunnel boring machines, or immersed tubes. They are dug … Continue reading How Are Underwater Tunnels Built? What You Need To Know