" 

 Here's a summary of the first 8 minutes (read more here):   
 Opening where the first Saw left off, we see Cary Elwes as Dr. Gordon dragging himself along the floor, his foot gone. He makes his way to a heating pipe and, mustering the courage, presses his amputated wound against the heat, cauterizing it. As he screams, we fade away.  !!!!!!    "