 Contrary to most other research stations on the continent , Troll is constructed on the snow @-@ free slope of solid rock breaking through the ice sheet at Jutulsessen , located 1 @,@ 275 meters ( 4 @,@ 183 ft ) above mean sea level . The station opened as a summer @-@ only station in 1990 and was taken into use as an all @-@ year station in 2005 . It has an overwintering capacity of eight people and a summer capacity of 40 . It is served by Troll Airfield , which is the base for the Dronning Maud Land Air Network . 
