The Apollo-19 mission was a secret NASA Apollo mission. The Mission was to scout out a potential alien civilization after the Apollo-18 crew reporting confirmed Alien Life on the moon (They're main point was to find Alien Life on the moon), after the LRO (Lunar Reconnaissance Orbiter) detected Man-Made structures on the far side of the Moon NASA had decided to send out their next secret Apollo mission (Which would be Apollo-19) to the area. Although the Mission went successfully, after drilling into one of the Man Made structures it appeared to be Hollow and infact were just large blocks of unknown origin. As much as NASA was disappointed, their next secret Apollo mission which was Apollo-20 would investigate a crashed Alien ship and a Lunar Civilization.