National Park Service's Submerged Resources Center has been coordinating research on the sunken battleship USS Arizona, in Pearl Harbor, Hawaii since 1998. This article outlines a research strategy and results of investigations into the nature and rate of the ship's corrosion, the status of the nearly 2.3 million litres of fuel oil still aboard the vessel, and our approach to managing a site that is both an historic war grave and a potential environmental threat. This project was designed to be a model for underwater cultural heritage site management internationally, specifi cally for other historic vessels leaking contaminants into the environment, and to produce results directly applicable to preservation and management of historical iron and steel vessels worldwide.