While this does indeed sound disturbing, there's a rational explanation for everything. Infrasound, which is sound below the frequency of human hearing, can cause some people to feel a presence or even hear things. Also, our brains are wired to recognize patterns, like names, even in random noise. It's called …

The establishment has nothing to gain from covering this up. It's ancient history, not like it's something that's gonna cause a scandal now. Sometimes, things just happen and we might not have a good explanation. That's not a cover-up, that's just history being its messy self.