"It came right up and opened its mouth right at my feet", Skomal says in the video.
A video from the Atlantic White Shark Conservancy was posted to YouTube on Monday.
"Whoa, holy crap! It jumped right out of the water!"
He said: "Did you see that?"
Video of the largest great white ever captured on film, a 20-foot shark dubbed "Deep Blue", resurfaced last week.More news: Video captures Brooklyn nail salon brawl, prompting calls for business to close
It also emphasises how it is becoming increasingly essential to conserve these remarkable creatures to stop them following megladons into extinction.
Over in the States, they generally drop the "great" and just call them "white sharks". However, the shark leaps out of the water and snaps at his toes, startling him.
"While out on research trips, we've seen white sharks breach and we've received multiple reports of breaching white sharks this year from fishermen and boaters", the Facebook post read.
"While encounters like this one are rare, this video shows that they're certainly possible", wrote the conservancy while sharing the terrifying video.
Two Cape Cod beaches were closed to swimmers Tuesday afternoon because at least one great white shark continues to lurk offshore of the Head of the Meadow Beach and Coast Guard Beach, according to Cape Cod National Seashore and Truro officials.