ELI5: Explain Like I'm 5

Marmaray Tunnel

Marmaray tunnel is like a secret underground tunnel that the big people in Istanbul have built to help people travel faster and easier. Imagine if you had to go on a big adventure and there was a very big ocean in the way, so instead of swimming or sailing across it, you can go through a special tunnel to reach the other side. That's what Marmaray tunnel is like.

This special tunnel is located under the big Bosphorus sea in Istanbul. It's very, very long and it's made of special materials so that the water from the sea doesn't come inside. That's why when people are inside the tunnel, they don't get wet or even see the water because the tunnel is protected!

Marmaray tunnel has trains running through it, like a big subway. The trains are made to travel fast, so people can get to where they want to go quicker. The inside of the trains is super cool too! They have seats and windows, just like regular trains, but they have doors that are extra strong to keep water and other things from getting in too.

Now people in Istanbul can travel from one side of the sea to the other side in less than 15 minutes! This is so cool because it used to take hours to get from one side to the other.

So that's what Marmaray tunnel is. It's like a special secret tunnel under the sea that helps people travel faster!