The Advisory Council on Underwater Archaeology (ACUA), the Society for Historical Archaeology (SHA), and the PAST Foundation are pleased to present the ACUA Underwater Archaeology Proceedings from the Annual Conferences on Historical Archaeology. The ACUA Underwater Archaeology Proceedings present current research conducted by academics, avocational archaeologists, students, and resource managers. The papers published in these volumes were originally presented as talks in organized conference sessions and are edited print versions of the research presented. They cover a broad range of topics related to underwater and nautical archaeology, from discussions of specific ships and shipwrecks around the world, to the results of scientific research and analysis, to broad based data management tools, assessments of the impact of climate change on underwater cultural heritage, and related studies on underwater material culture. Making information widely accessible is one of the key missions of the ACUA. The annual publication of the ACUA Underwater Archaeology Proceedings provides a timely outlet for professional research, and an opportunity for students and avocationals to share their work with a wide audience.