This document discusses definitions and classifications related to shipwrecks and salvage operations. It defines what constitutes a "wreck" according to various laws and conventions including sunken or stranded ships and objects from ships. It also discusses the agencies and international laws involved in salvage operations as well as classifications of salvage services. Finally, it outlines topics like apportionment of salvage awards, the role of coastal states, and policies regarding ownership of shipwrecks.