The excavations aim to study the chronology, architectural configuration, and water supply of the baths complex close to the forum of Cosa. In particular, the project analyses the synchronic development of the baths at both ground level and underground, a configuration that renders this complex rather unique. Intended as a supplement to the fieldwork previously published in Cosa III, the new campaign investigates a building and the socio-cultural context to which it belongs, discussing the general settlement narrative traced by preceding scholars. Alongside the excavations, a geophysical survey is analysing the extension of the urban area and proposing a new reading of the city plan.