Under water tannel
An underwater tunnel is a tunnel built below a river, sea, or ocean so vehicles or trains can pass underneath the water.
🌊 Types of Underwater Tunnels
1. Immersed Tube Tunnel
• Big concrete or steel sections are built on land.
• They are floated to the site and sunk into a trench underwater.
• Then they are joined together.
• Example: Some parts of the Hong Kong–Zhuhai–Macau Bridge.
2. Bored Tunnel
• A huge machine called a Tunnel Boring Machine (TBM) digs deep under the waterbed.
• The tunnel is built far below the surface.
• Example: Channel Tunnel (UK–France).
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🚆 Famous Underwater Tunnels
• Channel Tunnel (Eurotunnel) – Between England and France (about 50 km long).
• Seikan Tunnel – Japan (one of the longest undersea railway tunnels).
• Gotthard Base Tunnel – Switzerland (not under sea, but very deep and long).
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⚙️ How Are They Safe?
• Strong waterproof concrete
• Powerful ventilation systems
• Emergency exits
• Constant monitoring for leaks
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✅ Advantages
• Faster travel
• Works in bad weather
• No need for large bridges
If you want, I can also explain how Nepal could build an underwater tunnel or show a simple diagram explanation.
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