Faced with the intensification of marine heatwaves in the South Pacific, the MaHeWa project is mobilising researchers and local stakeholders in New Caledonia, French Polynesia and Wallis and Futuna. Launched in France in November 2024 as part of the french Priority Research Programme ‘Ocean & Climate’ , the objective of this major scientific programme is to better understand the physical mechanisms at work during marine heatwave phenomena, to measure their ecological and soc