Could algae be a solution to global problems of pollution, climate change, starvation and energy security? In an attempt to answer this question, The Algonauts' Road, a documentary project, travels around the world to pose this question directly to experts: these Algonauts are scientists, researchers, professionals, NGO and traditional harvesters who are innovating new and alternative ways of development. The Algonauts' Road aims to highlight the positive potential of algae, both micro-algae and seaweeds, and their role in sustainability. This proposition of scientific mediation is a way for attracting the general public in a quest for solutions. Since October 2010, The Algonauts' Road has traveled across 15 countries, covered almost 100000km, and interviewed more than 100 experts. There have been many encouraging discoveries of economically viable solutions to the challenges of sustainability: conversion of waste into a new resource, use of algae for combating global warming, undernourishment and poverty, production of energy, paper, medicines... The list is endless, and there is an optimism that solutions do exist. The Algonauts' Road is a professional action-research project with two principal objectives: environmental education with the use of film, animation and teaching aids, and promotion of economic activity related to algae in a consultancy role. The first mission led in Chiloe Island in Chile, with the support of the General Council of Finistere, demonstrated the value of video tools and learning from parallels in other countries for enhancing communication between scientists, sea farmers and politicians. The next step in The Algonauts' Road is the diffusion of information collected around the world in the form of a documentary film.