Wouldn’t that require so much sand/soil just to fill up the bottom part of the body of water? And the amount of sand/soil is so much that the land where you got the sand/soil from has changed significantly
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It depends how deep the water is. Nobody is planning to build artificial islands in the Mariana Trench. There are shallower areas where it is more feasible.
Yes, the amount of material would significantly change the area where you take it from. There are plenty of pictures of giant mines and quarries across the world… humans do drastically change the landscape when we want to dig up a lot of material. The material might also be taken from the ocean floor where the damage is real but isn’t as visible or well-understood, compared to a giant pit where a hill used to be.
The reason this makes sense (from somebody’s point of view, at least) is the area where the mine/quarry is was not being used or was not highly valuable while the artificial island will serve a purpose and be valuable.
Others will disagree that this is a good use of resources of course.
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