The proposals to air-condition the London Underground stations are revealed using 3D reconstructed graphics showing the techicalities and difficulties of installing these systems underground. We have cut-aways showing the processes of a year-long trial of a groundwater cooling system began in June 2006 at Victoria station. Metronet installed London South Bank University’s system comprising three fan coil units which use water that has seeped into the tunnels and is pumped from the tunnels to absorb the heat after which it is discharged in the sewer system.