They found what they're looking for. THey know it's location, and other parameters. They've guesstimated the arrival date, not they have their Hard Date for getting things underground.... no mystery. It's what I would do, why risk having it available so that some schmuck(s) might use it to do something like, you know, leak some images.

Planet X, Nibiru, Comet, Asteroid... whatever it is, they're nervous.

Sadly however, most people haven't a clue about where we are in the solar system, much less the universe... so they don't know where they're looking or what they're looking at. And they believe Everything the scion-tists tell them.