Witness Account

I've now heard about the same story three times from three different people, about the same type event happening in the same location all 20 years apart from each other. I know for a fact these three people have never met each other, and none of these people spend any time looking for or researching aliens in any way before or even after witnessing event. The only conclusion all of them came up with was a holographic mountain side which 2 of these people saw a silent ship fly out of the mountain, but most recently my friend and his coworker saw it silently fly into the mountain cliff side with no sound of a plane and no crash site or related noises/ vibrations. Just vanished into where it should have crashed.