The EU’s Digital Twin of the Ocean (DTO) is presented as a coherent, high-resolution, multi-dimensional, multi-variable and near real-time representation of the ocean that integrates new data sources with advanced modeling, artificial intelligence and high-performance computing. The two-way exchange of information between marine ecosystems and the digital twin is intended to create a feedback loop between the digital and physical realms that is emblematic of environing media. The EU’s vision is that the DTO will empower citizens, inform politicians, support a blue economy, and improve protection of the marine environment. The sociotechnical imaginary of the DTO presents a narrative that a balance between sustainable exploitation and conservation can be had through the use of sophisticated digital technology. But what is at stake in this technocratic control over the world ocean, and where does it come from? Whose interest will digital twins ultimately serve? Understood in its historical and environmental context, the DTO caters to the aims of sustainable development, but risks veiling continued unsustainable development and growth under the guise of new digital technologies. We use the theoretical lens of environing media and sociotechnical imaginaries to critically unpack this narrative and its historical contingencies, and show how difficult goal conflicts are systematically glossed over through a veil of datafication and technological development.