Hm... Maybe there were weaknesses in spacetime during the points that people came from, and something about this base is acting as like... a big spacetime black hole that's sucking everybody in?

[She definitely thinks it's because of SBurb, but she's going to let that bit rest for now.]

I have never seen something like that before, but it seems like a solid working theory to me! At least until we can get more information.