A lot of artificial reefs had been tried before ranging from old train wagons to piles of concrete blocks or tied tires. Is been done on purpose since 70's at least.
They are super effective, but don't last. Either end buried in the sand, are displaced by the currents (creating a danger for ships) or disintegrate after a few years. To have a Titanic you need absence of changes and coastal areas are very dynamic, with all those tidal forces, storms and coastal currents
On the other hand, sand ecosystems are fragile and valuable also in its own way. Wouldn't have any sense to replace al soft bottoms by hard bottoms just because.
So it works, for a while, but is expensive, can block shrimp fisheries, and the trend is not so hot as it was.
They are super effective, but don't last. Either end buried in the sand, are displaced by the currents (creating a danger for ships) or disintegrate after a few years. To have a Titanic you need absence of changes and coastal areas are very dynamic, with all those tidal forces, storms and coastal currents
On the other hand, sand ecosystems are fragile and valuable also in its own way. Wouldn't have any sense to replace al soft bottoms by hard bottoms just because.
So it works, for a while, but is expensive, can block shrimp fisheries, and the trend is not so hot as it was.