When the Royal Library had to expand, with the amount of required space they had only one choice - to go underground.

In the early summer of 1997, The Royal Library (Kungliga Bibilioteket in Swedish) was reopened after an extensive renovation and extension. In connection with that came the two large underground buildings, called "KB Annexet". These huge underground structures now hold most of the library's collections. Warehouse spaces that used to be in the upper floor of the main building were vacant and are now used as offices and reading rooms. In one of the underground warehouses there is an exact copy of Nelly Sachs' apartment from Bergsund beach, complete with all her belongings.

In the KB Annexet there are also auditoriums, study rooms, research rooms, exhibition rooms and microfilm reading rooms. In the microfilm reading room, all Swedish newspapers, as well as a large number of foreign newspapers, are available on microfilm. Across the annex extends a large, arched glass roof which has contact with the northern facade of the main building. The years 2014-2015, the annex's public section has been rebuilt and modernized.

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