There were two people behind the camera. Who saw nothing at the time but could hear noises coming from further down the tunnel. I think the noise you can hear is the photographers clothing rustling and the noise of the camera.
I would say that's probably the most likely natural explanation. I have filmed breath in cold conditions through infrared with a similar camera set up and had quite different results. You would have to test with the same camera and conditions to rule it out though. All we can go on is the footage goes on for some time and it's the only anomaly throughout.
Not sure if your being serious but I don't think it's dust.
Just don't look right. Although not impossible I guess.
It's looks in human form to me but that could just be paradolia.
Could even be a defect on the video tape. I say that because it moves in a straight line.
I've been invovled in paranormal investigation long enough to know that whenever you can't explain something you just say 'Dust' while nodding your head in a sage-like fashion and everyone will continue to think you know what you're talking about.
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