Guinness adjudicator Michael Empric made a rare trip from New York City to do the official head count between 9 a.m and 11 a.m.
“I actually stood there and clicked off everyone as they got in the water,” he said sporting the dark blue Guinness blazer and teal tie in 87 degree heat.
Divers entered the ocean in waves and had to stay in the water at least 15 minutes to be counted.
Dahlia Bolin, 13, was among them. She and her mother Rebecca came all the way from Mackinaw, Illinois, to help set the record, and pick up debris.