Nonprofit underwater archaeology organizations, other than UNESCO, are non-governmental entities committed to legally investigating archaeological sites in accordance with UNESCO guidelines and governmental regulations. These organizations, officially recognized in the countries where they operate, are typically established by scientists and divers passionate about archaeology and history. In addition to investigating sites, they educate scholars, governments, sport divers, and the general public about underwater archaeology and the preservation of underwater historical sites.

- Advisory Council on Underwater Archaeology The Advisory Council on Underwater Archaeology (ACUA) presents itself as an international advisory body on issues relating to underwater archaeology, conservation, and submerged cultural resources management. It works to educate scholars, governments, sport divers, and the general public about underwater archaeology and the preservation of underwater resources. Website: https://acuaonline.org/ Email: info@acuaonline.org Headquarters location: Not found The organization is affiliated to the Society for Historical Archeology, an organization that focuses on the archaeology of the modern world, headquatered 13017 Wisteria Drive #395, Germantown, U.S.A. Website: https://sha.org/ Email: hq@sha.org

- Institut Europeen d’Archeologie Sous-Marine The Institut Européen d’Archeologie Sous-Marine (IEASM), also known as the European Institute for Underwater Archaeology, was founded in 1987 as a French non-profit organization. The IEASM specializes in locating, exploring, excavating, and restoring sunken archaeological sites. It collaborates closely with authorities in the countries where it conducts excavations, involving specialists in archaeology, history, conservation, restoration, geophysics, and geology. significance. Website: https://ieasm.institute/news.php?lang=en Headquarters: 17 rue Thouin, 75005 Paris

- Southeast Asian Archeology (Underwater Archaeology Division) Southeast Asian Archaeology is dedicated to the multidisciplinary investigation of Southeast Asia's archaeological past. Its mission is to advance knowledge for the benefit of both scholars and the public. Website: https://www.southeastasianarchaeology.com/underwater- archaeology/ Contact: https://www.southeastasianarchaeology.com/contact/

- Institute of Nautical Archaeology The Institute of Nautical Archeology is a non-profit, international research organization affiliated with Texas A&M University as an independent academic unit. Website: https://nauticalarch.org/ Email: info@nauticalarch.org Phone: 979.845.6694 Headquarters: P.O. Drawer HG, College Station, TX 77841-5137 - USA

- Save Ontario Shipwrecks Save Ontario Shipwrecks is a Provincial Heritage Organization in Ontario dedicated to the study, preservation and promotion of an appreciation of Ontario’s marine heritage. Incorporated in 1981, SOS is a public charitable organization of dedicated volunteers from across the Province. Website: https://saveontarioshipwrecks.ca/ Email: https://saveontarioshipwrecks.ca/contact/ Phone: +1 519-676-4110 Headquarters: 75 Industrial Ave, Blenheim Ontario N0P 1A0 - Canada

- The Nautical Archaeology Society This charitable organization is engaged in the research, documentation, and protection of underwater and coastal heritage in the United Kingdom. It maintains robust connections with other organizations worldwide, collaborating to promote the cause on a global scale. Website: https://www.nauticalarchaeologysociety.org/ Email: nas@nauticalarchaeologysociety.org Phone: +44 (0)23 9281 8419 Headquarters: Fort Cumberland, Fort Cumberland Road, Portsmouth PO4 9LD - United Kingdom

- The Oxford Centre for Maritime Archaeology The Oxford Centre for Maritime Archaeology (OCMA) is a specialist research group within the School of Archaeology, supported by the Hilti Foundation. It is devoted to the study of people who live or work on and around water. Website: https://ocma.arch.ox.ac.uk/ Email: damian.robinson@arch.ox.ac.uk (Dr Damian Robinson) Phone: +44 (0)1865 611744 (Dr Damian Robinson) Headquarters: Institute of Achaeology 36 Beaumont St Oxford OX1 2PG United Kingdom

- Maritime Archaeology Trust The Maritime Archeology Trust is a registered charity with over 30 years of experience in the research and study of marine cultural heritage. Website: https://www.maritimearchaeologytrust.org/ Email: info@maritimearchaeologytrust.org Phone: +44 2380 593290 or +44 2380 237300 Headquarters: Room 014/11, National Oceanography Centre European Way, Southampton SO14 3ZH - United Kingdom