The SEA project (Seeking for Ecological Alternatives) is born from the need, in our schools, to offer our students a coherent, intelligent and shared response to their serious worries about the climate. The project aims to immerse students from two European schools in a deep reflection on current climate problems and ecology in general. Because we are convinced that technology can be reconciled with ecology, we want to gather around one common thread: the construction of an underwater robot able of taking effective measures of water quality in the Mediterranean and North Sea. The Champion's Providence Institute and the Kalamaria Second High School in Greece have all STEM classes (Science Technology Engeneering and Mathematics). Because their orientation is particularly appropriate, these students will be the driving force of the project. Beyond the symbolic, the construction of the robot also aims to raise their motivation and their empowerment.