Below is the description of the video on YouTube:
"Sent to me by a viewer, they wrote 'Not sure what the hell I saw, but caught part of it on video. This thing was in Lake Champlain and it was massive. I first saw the neck which was sticking out of the water about 6 feet. Could this be Champ?' Any Ideas?"
From watching the video, I can say that the person who filmed it was right - this thing does look massive. Unlike most cryptid videos and photos I see online, I actually thought this one was pretty impressive. Whatever is in it is big, and causes a huge splash near the end.
What do you think this video shows? I