Oceans Odyssey 2 presents the results of the discovery and archaeological survey of ten deep-water wrecks by Odyssey Marine Exploration. In the Western Approaches and western English Channel, a mid-17th century armed merchantman, the guns of Admiral Balchin’s Victory (1744), the mid-18th century French privateer La Marquise de Tourny and six German U-boats lost at the end of World War II are examined in depth. From the Atlantic coast of the United States, the Jacksonville ‘Blue China’ wreck’s British ceramics, tobacco pipes and American glass wares bring to life the story of a remarkable East Coast schooner lost in the mid-19th century. These unique sites expand the boundaries of human knowledge, highlighting the great promise of deep-sea wrecks, the technology needed to explore them and the threats from nature and man that these wonders face. Challenges to managing underwater cultural heritage are also discussed, along with proposed solutions for curating and storing collections.