19:42 Join our dive team and explore the massive hidden underground rivers, caverns, and waterways of the Floridan Aquifer. Quadrillions of gallons of crystal clear fresh water "spring" to the surface all over Florida and the southeast United States... but although it is clear water, is it clean water? Is it safe to drink? What are the impacts of generations of agriculture and urbanization? We follow technical diver, Jill Heinerth, and a team of explorers and scientists to find out. We talk to farmers and researchers about a sustainable future. Students learn how essential the Aquifer is for millions of people and how we must all work together to keep it safe.