Bridge tunnels, also known as immersed tube tunnels or submerged floating tunnels, are unique engineering marvels that combine elements of both bridges and tunnels. They are typically used to cross bodies of water where traditional bridges or tunnels are impractical due to factors like depth, navigational requirements, or environmental concerns. Here are examples of notable bridge tunnels from around the world:

Chesapeake Bay Bridge-Tunnel (USA)

Spanning the Chesapeake Bay in Virginia, it consists of a series of low-level trestles, two-mile-long tunnels, and two bridges.

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