Sargassum Seaweed is usually what washes up to shores and makes beaches ugly. Resorts in the Mexico and Caribbean regions get a lot of it ashore, but there are now industries that use the seaweed as a building material.
Sargablocks[1] are one of the companies that are turning sargassum into cheap building materials
Sargablocks[1] are one of the companies that are turning sargassum into cheap building materials
[1] - https://fortomorrow.org/explore-solutions/sargablock