Located in Stockholm, Sweden, Bahnof’s Pionen is defintely the coolest underground datacenter that we’ve seen. It’s 30-meters below the surface and “was built in a former bomb shelter, thus it can withstand a direct attack with a hydrogen bomb.” Even more surprising, this datacenter recently hosted the controversial Wikileaks website. Videos after the break. Click here for the first picture in the gallery.

Two Maybach MTU diesel engines from a submarine are responsible for backup power supply. Together they produce 1.5 megawatts of power. The entrance doors are 40 cm thick. The place is surrounded with the granite and it just mesmerizes with its beauty.

[via DCP]