Green Mountain DC1 Stavanger - Norway
Green Mountain's DC1 facility (server room pictured before the racks were installed) is built in a former underground NATO ammunition storehouse on a small island in Norway. It is powered by hydroelectric power systems, and is cooled using the available water at a depth of 75 meters, which remains at 8°C (46°F) year-round. The facility is made to be airtight, and the oxygen level in the server facilities is kept at 15%, which prevents the ability of fires to start; this has the added benefit of preventing secondary damage from the chemicals needed to extinguish fires.
Image: Green Mountain