Desalination plants create underwater rivers of heavy salt water

Modern desalination plants operate as massive density experiments, transforming seawater into two distinct streams. For every liter of drinkable water produced, these facilities discharge roughly 1.5 liters of hypersaline brine. This waste liquid is nearly twice as salty as the surrounding ocean, making it significantly heavier than the water it enters. Instead of mixing, the brine acts like a slow-motion cold front, sinking immediately to the seabed and carving out underwater rivers that can stretch for kilometers along the sloping seafloor.