One possible explanation is wano.
200 mtrs rise won't happen over night. It had to be a gradual process.
So, what if ancient people made construction to stop flooding like in case of wano.
But, water level rose so much that everything went under water except for higher elevated regions...
It depends on what caused the sea rise.
If events like expansion of sea water (global warming) or melting of ice then sure
But in case of events like subsidence of continental floor/rise of sea floor due to shift in the crust then 200 mtrs isn't the threshold anymore. It might go deeper than...
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