Secrets of Area 51

Area 51 is renowned for being one of the most top secret sites on earth. After years shrouded in mystery, the CIA released classified information about the missions that took place in years past. This 1 hour special tells the unique perspective of the CIA agents who worked hard to cover up years of secret missions and the employees who worked inside Area 51. What really happens at the most secret military base in the world? (National Geographic)