During 2020 and 2021 (during covid lockdowns), we created a maintained the whole pipeline for the feature film The Siren (by Sepideh Farsi). 8 studios where involved, and Blender was a the core of the pipeline. In this talk, made during the last Blender Conference 2022, you can discover the pipeline and workflow, the huge pile of free and open source technologies used to make this 1800+ shots movie.