In a Colombian coalmine, scientists have uncovered the fossil discovery of the decade - the remains of a lost world totally new to science. A place and time where giant creatures roamed long after the death of the dinosaurs - turtles with 12 foot shells, 40 foot crocodile and biggest among them, Titanoboa, the largest snake of all time: a 50 foot monster at least 10 times the weight of the largest snakes today. We follow the team that discovered this colossal creature as they go back to Colombia to unravel the secrets of this super-sized world and solve the mystery of how a monster like Titanoboa could ever have existed.