More than a year and a half after the University of Minnesota made headlines when an administrator halted the premiere of an environmental documentary, controversy and questions persist at the Twin Cities university. "Troubled Waters: A Mississippi River Story" took nearly four years to make. It explores how agricultural runoff and pollution contribute to the largest dead zone in the world, where the Mississippi spills into the Gulf of Mexico. A team of researchers, filmmakers, and scientists has been up and down the Mississippi River, knee-deep in swamps and icy waters, and elbow-deep in footage and research, looking at the central role of agriculture and pollution in creating that oxygen-depleted zone. University of Minnesota faculty and staff members, including members of the university's Academic Freedom and Tenure Committee, have discussed the fallout from "Troubled Waters" at length. At the University of Minnesota, new measures are in place to ensure that academic freedom is protected from donor and administrative pressures. The Academic Freedom and Tenure Committee used the controversy as an opportunity to reiterate the protections of academic freedom at the university, particularly for those who are not considered faculty or staff. The author discusses efforts to dam the free flow of information about Mississippi River pollution.