The Boston Globe identified the man who was just inches from the shark's mouth as a MA state biologist named Greg Skomal. If you slow the video down, you can see the wide-open mouth gaping just below the researcher's boots.
Two hours later the flag status was changed to yellow and beach goers were told they could swim at their own risk. Mr Skomal can be heard saying in the video.
Skomal adds, "It came right out and opened his mouth right at my feet".
Biologist Greg Skomal of the Massachusetts Division of Marine Fisheries had a shark snap at his feet.
Researchers off the MA coast captured video of a great white shark breaching and snapping its jaws at a scientist's feet.
In a statement, the conservancy said: "While encounters like this one are rare, this video shows that they're certainly possible".
The conservancy aren't the only researchers to be left gob-smacked by the wild and potentially risky behaviour of sharks.
We usually think of great whites being a quintessentially Aussie shark, but this chap was filmed off the coast of Massachusetts, US.
The nonprofit Atlantic White Shark Conservancy is on a mission to support scientific research into white sharks while also promoting public safety, education and shark conservation.