The Underwater Cultural Heritage Act 2018 is an Australian Act of Parliament designed "to protect shipwrecks, sunken aircraft and their associated artefacts, that occurred 75 or more years ago, regardless of whether their location is known". Other underwater heritage items, and more recent shipwrecks or aircraft, may be protected through a declaration under the Underwater Heritage Act, and some sites also have a protected zone around them. The federal government works in collaboration with State and Territory Government agencies to protect and conserve Australia's underwater heritage.