Sargassum, a type of brown, floating, and foul-smelling seaweed, has historically been seen as a nuisance. Its presence has been noted as far back as the fourth century BC in the maritime geography poem, Ora Maritima, where it was associated with terrifying sea monsters. More recently, it has become a significant problem on the beaches of the Caribbean.

Contrary to popular belief, sargassum doesn't indicate the presence of land as it grows in the open ocean. The infamous Sargasso Sea, located in the middle of the North Atlantic, spans over five million square kilometers and is home to vast amounts of sargassum. However, in the first decade of the 21st century, a significant increase in sargassum was observed along the coasts of the Caribbean Sea.

The unpredictable spread of sargassum across the Caribbean, aided by wind and tide, is currently under investigation. Various strategies to combat this issue have been proposed, including the development of an early warning system to alert about incoming sargassum. Other measures include methods for collecting the seaweed and potential uses for it in agriculture, livestock, and industry.

While we no longer believe that monstrous creatures violently swim through the sargassum as described in Ora Maritima, the fight against this persistent seaweed continues.