This video is called Best Shark Attack Video – gigantic Great White Shark in South Africa while Cage Diving. It is about a great white shark, as filmed from a cage with divers inside.
Here is information on its fossil relative Procarcharodon, at 10 metres long still bigger, from the Oligocene period.
I am learning slowly how to embed videos in this blog; and I hope to do more.
Great white shark near Cornwall, see here.