Struggling to explain what I mean, every major city/river/harbour doesn’t have a natural coast line, but generally a stone wall that goes down into the river and creates a permanent solid edge. I’m sure with modern technology its easier, but the ones built hundreds of years ago baffle me. Tried googling it but got a combination of Minecraft, retaining wall and river rock information..
In: Technology
5yo version: There’s a few ways. One way is that they build a wall in the water where they want to work and then use buckets to take out all the water. So they can work on dry ground. Another way is just dump stone and earth into the water where they want the wall and then when it’s shallow enough they build a nicer wall above water. As others have mentioned, they could also divert rivers, but you can’t really divert the ocean! The chief exception being the sea dykes in Denmark!
Here’s an awesome animation of how it was done: [https://www.youtube.com/watch?v=nJgD6gyi0Wk](https://www.youtube.com/watch?v=nJgD6gyi0Wk)
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