In two landmark films for BBC2, Ben Fogle travels to Botswana and Australia, joining a pilot research study which aims to do the unthinkable – swim with crocodiles.   Crocs have become the biggest killers of humans in Africa – up to 700 this year – so new research is vital.  These ancient reptiles spend roughly 80% of their lives underwater, yet scientists have never studied them in their own environment – until now.  During this awe-inspiring journey from the Okavango delta to the Northern Territories, Fogle gains unique unparalleled access to the monster of legend and gains a whole new perspective on these magnificent creatures.