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The climatic conditions, of course, are not the reason why the Divertor Test Platform 2 (DTP2) has been established in Finland. It is rather because of the long experience that engineers at VTT and those at the nearby Tampere University of Technology have in the field of water hydraulics. As oil is a "no go" in a nuclear environment such as ITER, (see textbox) water is the only fluid that can be used within the hydraulics that will move ten-tonne divertor cassettes into position with millimetre precision.Why is water preferred to oil in the hydraulic systems? Inside the ITER vacuum vessel any leakage of oil would be very hard to clean. Also leakages—whether oil or mineralized water— would become activated. Demineralized water is hence preferred for the hydraulic systems.