This report details a nine-month summative evaluation of the Underwater Dome Exhibit at the Seattle Aquarium. The study was undertaken to inform the Aquarium's development of short- term, cost-effective updates to improve visitor satisfaction and experience in the dome. The study sought to develop a baseline understanding of how visitors use and react to the exhibit, as well as to determine whether or not visitors understand that the dome represents the Puget Sound. Data was collected using observational and survey instruments (included in the appendix of this report).