Tramhaven is a dive site in South Holland where you can do exploration dives. In 2019, the sluices of the Haringvliet dam were partially opened. Scientists hope that the herring and trout that once lived here will return. See what new species you encounter. For now, you'll see mostly plants, oysters and freshwater fish such as perch and roach. As the water gets saltier, biodiversity may increase. Tramhaven is named after the historic tram line that used to run here.