TESEO is a 3D, state-of-knowledge, numerical model to simulate the transport and degradation of hydrocarbons, as well as the drift of floating objects and people in marine environments, on both regional (offshore) and local (ports, bays and estuaries) scales. It consists of a transport module and a hydrocarbon weathering module, coupled to a near-field model to simulate deep explosions (blowouts).

TESEO has been used in the response to accidental spills, such as the sinking of the ship Prestige (Galicia, 2002) and that of the ship Grande America (Bay of Biscay, 2019), in anti-pollution exercises organized by Salvamento Marítimo and has been implemented in various systems of oil spills prevention and management for companies in the oil sector in the maritime and port sectors.