The population of seahorses in Ria Formosa in southern Portugal was probably the largest in the world. But in the mid-2010s, it collapsed, and 95% of the seahorses disappeared. Climate change, poachers, and environmental pollutants are believed to be the causes.
In southern Portugal, a group of passionate divers has deliberately sunk four large marine vessels, not only to enhance the diving experience but also to foster new habitats for marine life.
