Lydia 'just kept swimming' for 57,000 kilometres

A Great White Shark named Lydia had a tracking device attached to her dorsal fin four years ago. Since then, a team of scientists have been tracking her every move and putting it up on the web: http://www.ocearch.org/tracker/. Robert Hueter explains what they’ve learned so far.

(Image: Great White Shark Lydia was tagged off the coast of Florida in 2013. Credit: Ocearch.org)