A best off of giant bluefin tuna footages taken while freediving in the Atlantic Ocean for the last five years: In the North Atlantic off the Canada coast and in the North West Atlantic off the coast of Africa.
Video taken from 60 to 90 feet depth close to the 40 to 60 miles per hour swimming fish and at the time they were hunting fiercely in herring or sardine school.
About hundred boat trips made there and only a couple of opportunity to see action, pretty insane action in the middle of nowhere !
Bluefin tuna is definitively one of the most amazing blue planet apex predator...
http://www.youtube.com/watch?v=KUXs9PbAtVo