(FILES) A photograph taken on July 8, 2020 shows cooler installationson the roof of the new MRS3 Interxion datacenter, settled in a former submarine base built by the Germans during the Second World War, in Marseille harbour, southern France. Three data centres of the US group Digital Realty, located in Marseille's harbour, are cooled by "river cooling", a process using 3000 cubic metres per hour of mineral-rich water unfit for consumption, from an old coal mine, lowering the centre's energy footprint by 20 per cent and eradicating its need for airconditioning. (Photo by CLEMENT MAHOUDEAU / AFP) (Photo by CLEMENT MAHOUDEAU/AFP via Getty Images)