Endowment will spread diver’s love of exploration to new generations Nestled in the Ozark hills near Cassville, Roaring River State Park is home to one of the deepest underwater cave systems in the country. For decades, divers have tried to chart the vast caverns of Roaring River Spring, which, according to the Missouri Department of Natural Resources, pumps 20 million gallons of turquoise, 57-degree water into the river every day.