00:00Did you know there's an undecipherable message at CIA headquarters that has challenged experts for over
00:0530 years old?
00:06In Langley, Virginia, there is a sculpture called Cryptos, created by Jim Sanborn in 1990.
00:11The sculpture has a coded message in four sections.
00:14Three have been deciphered, but the fourth, known as K4, remains a mystery.
00:19Even the NSA has tried unsuccessfully to decipher it.
00:22Sanborn has given clues, such as the fact that the words Berlin and Hours are in K4.
00:26Sanborn says the final message contains a secret within a secret.
00:31Could it change our understanding of history?
00:33The crypto puzzle remains one of the world's greatest cryptographic challenges.
00:38Will it ever be resolved?
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