Heritage Daily has an article with more details, undersea mapping, photos, and cites the source (the International Journal of Nautical Archeaology).
https://www.heritagedaily.com/2025/12/network-of-submerged-s...
It is not a wall, but rather a “network of submerged stone structures”.
I think within no time it will be modded with motors, maybe salvaged from broken electrical appliances and it will come full circle.