I just looked at a ton of videos, 99% of it is bullshit/something legit happening. either way, it barely created any attention in january so who cares? if the world is gonna end, its gonna end, nothing we do will change that, if it doesnt, then sick, we keep living. jesus.
I hate to say this and will probably sound like a tool, as my friend quickly called me, but I happened to hear the same sound one evening and when I found the videos with a similar sound, I got more scared than I knew imaginable...but to be honest it doesn't sound unfamiliar, it sounded like metallic noises from freight trains braking under load and the cars settling. I'm positive that's what it is, and it was actually echoing from the direction of the rail yard. However it was quite overwhelming of a noise and when I heard it, I was fucking weirded out, like I've never heard such a totally deep, reverberating noise. Spooky if you ask me, but I am not superstitious, and I'd bet there's a man-made or even natural explanation.
Even if it was some big government/world wide experiment, thatd made more sense because its been kept so mellow, exactly what the government would want. My guess, its some other shit, but if the world is ending, lets rage!