The European interdisciplinary collaboration Seas Oceans and Public Health In Europe (SOPHIE) Project has outlined the initial steps that a wide range of organisations could take to work together to protect the largest connected ecosystem on Earth. In a commentary paper published in the American Journal of Public Health the researchers, among them Torsten Thiele of the Institute for Advanced Sustainability Studies (IASS), call on public health and medical professionals to harness the UN Ocean Decade (2021-2030) as a meaningful catalyst for global change, reminding us that ocean health is intricately linked to human health.