Computers get hot. Google data centres? They’ve got lots of them. Their new centre in Hamina, Finland, was built in an old paper mill with a network of granite tunnels underneath them. Tunnels filled with cold sea water Google could pump into their centre to rob the computers of heat before Google sent the water back from where it came from, mixed with more cold water so it wouldn’t affect wildlife. This is an inspiring design decision. [BI via Scuttlefish]