The expedition to the Mexican island of Guadalupe is on its last day. Throughout the past week, the great white team set new records for landing, tagging and safely releasing the biggest sharks ever! But on this final day, the best is yet to come. Until now, the most prized treasure to help solve a puzzling mystery in the great white story has been elusive. With only a few hours left they finally get what they need -a blood sample from a mature great white female.