sargasso seaweed as construction material

http://www.theyucatantimes.com/2018..._H-xzVGzNRwCzf2sWJyRg-ERtURbZgijLI8deCMo

Sargasso used to make building blocks. Maybe a new SXM industry.

Wonder what happens when it gets wet. Would the smell come back when it molds? Great idea if it has no long term drawbacks.