Swimmer circumnavigates Martha's Vineyard ahead of 'Jaws' 50th anniversary

Endurance swimmer Lewis Pugh swims near the Edgartown Harbor Light on Thursday in Edgartown, Mass.

Lewis Pugh wants to change public perceptions and encourage protections for sharks — which he said the film maligned as "villains, as cold-blooded killers."

(Image credit: Robert F. Bukaty)