The swimmer at Rockaway Beach was hospitalised with a massive thigh wound.
Blue Shark Snorkel Trips, the company that organised the tour, said bites were "extremely rare".
The project is intended to track the health of sharks, turtles and sea snakes that live in the high seas.
"I did what anyone would have done," he said. "The shark was latched onto her leg. I just jumped into the water."
Future summers at the beach are going to be interesting.
The moment is perhaps proof of whale's intuitive nature to protect other species of animal - including humans.
‘I’m about to die. I’m literally about to die.'