although this has not been officially said, many independent studies say that there is a second, deeper metro system designed for emergency evacuation of important city personnel in case of attack. it is believed that it consists of a single track and connects the kremlin, chief hq (genshtab), lubyanka (fsb headquarters) and the ministry of defence, as well as numerous other secret installations. there are also entrances to the system from several civilian buildings such as the russian state library, moscow state university (msu) and at least two stations of the regular metro.[citation needed] it is speculated that these would allow for the evacuation of a small number of randomly chosen civilians, in addition to most of the elite military personnel. the only known junction between the secret system and normal metro is behind the station sportivnaya of the sokolnicheskaya line.