posted on May, 14 2013 @ 06:39 AM
Occam's razor: the simplest explanation is most likely the correct one. The possibilities:
1) It was an elaborate hoax, involving hidden boats / underwater vessels / CGI, etc.
2) It was genuinely some sort of lake monster that no-one has ever caught or filmed before
3) It was a whale, and the guy who said it definitely wasn't a whale is mistaken
Much as I would like it to be number 2, I'm gonna go with number 3.