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Additionally the US military (and others) has extensive documented experience in detonating nuclear explosions underground, which is known to form an underground cavity
Originally posted by WhizPhiz
reply to post by Magnus47
However, one thing the tunnel boring theory can't account for is the weird flashes of light and sudden halting of the sound.
That is true. But that would imply they stopped the boring machine after they realized they took out a transformer. Which would also mean they'd need to start the machine up again if they want to continue the tunnel. So if this theory is correct, chances are the people that filmed that event will hear the same sound again at some point.
However, it can still be explained as a busted transformer in a power line (out of sight from the camera), sparking because it's getting shaken by the vibrating ground beneath it.
Originally posted by WhizPhiz
reply to post by Magnus47
That is true. But that would imply they stopped the boring machine after they realized they took out a transformer. Which would also mean they'd need to start the machine up again if they want to continue the tunnel. So if this theory is correct, chances are the people that filmed that event will hear the same sound again at some point.
However, it can still be explained as a busted transformer in a power line (out of sight from the camera), sparking because it's getting shaken by the vibrating ground beneath it.