[link to youtu.be] This one that just happened in Costa Rica, sounds like the one that happened in Colorado. Remember the sounds started happening from the cave last year? And the one in the video that happened in Russia was like the cave sound.

Some think that the Colorado one had something to do with explosions from an underground base, which could have caused the earthquake later.

I've been following the sounds as well, only on fb.

It'll be interesting to see what happens with the latest sounds.