Lakes and rivers under the ocean? These are called brine pools. They are so salty that they don't mix with the surrounding seawater, creating a surreal underwater lake effect. It's like discovering a hidden world within our own oceans. Crazy but true brine pool,Brine pool,River under ocean,Lake under ocean,Crazy but true facts,Did you know,Crazy but true ocean,Brine pools,Science,Science facts,Crazy science facts,Science made fun,Fun facts, underwater lake surreal calm peaceful oceanography seafloor geology marine life