These are very interesting videos that's for sure. I'm a bit confused on whether or not to trust them however. Seeing as they are on youtube, a site which is no stranger to fake footage, they sort of lose some credibility to me. Then again it makes sense that if these are genuine, that the people who filmed the footage would possibly wait till they are more comfortable (with what they witnessed or with releasing the videos in general) to release their videos. And well what better way then youtube, which is the largest video sharing site on the web, which also gives them a bit of anonymity.