공사 중 인부들은 엄격한 신원 조회를 받았고, 설계를 맡은 건축사마저 출입이 제한될 정도로 보안이 철저했다고 한다.
During the construction, workers received strict background checks, and it is said to have been so tightly guarded that even the architect in charge of the design was restricted from entering.