At a depth of 30 meters below the granite rocks is Pionen - Underground data center. It was built in a former bomb shelter and so is able to withstand a direct hit by a hydrogen bomb. For backup power in it meet the two diesel engines Maybach MTU from the submarine, which together give 1, 5 megawatts of power. At the entrance doors are as thick as 40 cm. Around the granite and for all that, this place is fascinating for its beauty.