🚇 How Do You Build a Tunnel Underwater?
Tunnels help people and cars go through mountains, under cities, and even beneath rivers and oceans. But how do you build a tunnel where there’s water all around?
Engineers have a few smart tricks. One way is to dig through the ground under the water. They use special tunnel boring machines—giant tools that drill, scoop, and push dirt out of the way. These machines are strong enough to go through rock and mud!
Another way is called the immersed tube method. Here’s how it works: builders make giant tunnel pieces on land, float them out to the water, then sink them into a trench. Once they’re in the right spot, the pieces are connected, sealed, and covered with rocks to stay put.
Tunnels must be strong enough to handle water pressure and weight from above. Builders use concrete, steel, and waterproof seals to keep everything safe and dry.
Did You Know?
The tunnel under the English Channel connects England and France—and it runs over 30 miles long under the sea!
🧠Your Challenge:
Design a tunnel that runs through another object. It could go through a mountain, a hill, or even a block of clay. What tools or materials would you need to keep it from collapsing?
