There is! Lots of places already rely on marine sand, but extracting it has its own challenges and environmental issues. Lots of details here: https://worldoce

There is! Lots of places already rely on marine sand, but extracting it has its own challenges and environmental issues. Lots of details here: https://worldoceanreview.com/en/wor-3/mineral-resources/deposits-and-markets/sand-gravel-and-phosphate-from-the-sea/ https://worldoceanreview.com/en/wor-3/mineral-resources/depo...