The video is brought to us courtesy of Cageside MMA. Adam Song and Cesar Moreno demonstrate a North-South position escape that can be used in both BJJ and MMA competitions. The key to this move besides obvious drilling of the move is this:
The KEY point in any escape from the bottom is to maintain a good frame with your arms, to keep space between your opponent and yourself. If you let him flatten out and crush you, you will be hard pressed to use any escape, while creating this "hole" will allow any number of escapes.
Now go practice!