As part of the CCTs of the MaHeWa project—whose objective is to co-construct crisis-response strategies and long-term adaptation solutions through transdisciplinary approaches—a second workshop was held on 21 October 2025 at the Ifremer center in Vairao. The meeting brought together around thirty participants, including municipal representatives, environmental associations, staff from the Marine Resources Department, representatives of the Interministerial Delegation for Climate and Sustainable Development, and several researchers involved in the project. The workshop aimed to discuss in concrete terms the effects of ocean heatwaves and the collective actions that could be developed to mitigate their impacts on ecosystems and human activities. A first workshop of this kind had already taken place in Nouméa, New Caledonia.