> Its protection is more serious than that of any existing nuclear power plants or any banks in the world. In addition to numerous Swiss guards, the library is guarded by state-of-the-art automatic systems that form several layers. > Hidden within its walls lie rare secret documents, letters, state papers, books, photographs, and films, and even advanced technologies from our ancestors. Containing tens of thousands of volumes of work stored on an estimated 53 miles of underground space and shelving. > Browsing the library is forbidden and not allowed either.