I spent a week in Tulum in early November. Here's a video from a couple dives.
[video=youtube;UeMVhvcHZEY]http://www.youtube.com/watch?feature=player_embedded&v=UeMVhvcHZEY[/video]
[video=youtube;UeMVhvcHZEY]http://www.youtube.com/watch?feature=player_embedded&v=UeMVhvcHZEY[/video]