World underwater: technical viability

I want to put a story in place where a country lived underwater, and I am wondering of its viability. Here is the world description:

• It is a square of 100 km*100 km on the ocean with the weather and the currents of the Atlantic.
• It is from the surface to 100 meters to 1 kilometer depth (depending on the viability).
• People (consider them as human shape sharks) are near the billions.
• They live in columns of habitation that are corners of a central square where common people spend the main part of the day: thus they lived in a matrix of habitations around squares of free space.

My concerns are about the capacity of such a structure, with modern technology, to resist storms, currents, etc... for a long time (over one century). Some maintenance is possible, but it should not be too expensive.

EDIT: More information

• Any modern material is at your disposal to build the column in which people live.
• The columns should be able to float by themselves.
• The little squares surrounded by four columns each are 1 square kilometer or 100 hundred meters wide. Thus you have also the number of columns.
• The columns are linked by boats at the top and by some sorts of railway at the bottom. The bottom links can help to maintain the stability of the matrix of columns.

About the human shaped sharks: These human-shaped creatures are able to breathe underwater, and lived for a long time in this structure.

The structure has been built on purpose, with plans and the best materials available in 20th century.

The way the raw materials have been maneuvered and transported should not be taken into account in the question. The material could be taken on coral reefs (as said in a comment) or could be from mineral origin (stone) or transformed (steel...).

posted almost 5 years ago

totalMongot‭

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