In 2018, the island of Mayotte is shaken by a long series of earthquakes. While searching for the origin of this seismic crisis, scientists discovered a huge active underwater volcano a few kilometers off the coast. Since then, a large-scale oceanographic mission has been trying to unravel the mysteries of the youngest volcano on the planet... because the daily life of the people of Mayotte has been turned upside down by this new, unpredictable neighbor.