A boy miraculously survived a shark bite thanks to the help of his older sister, father, and a nearby dive boat.

A shark bit a boy's leg while he was snorkeling in the Atlantic Ocean near Key Largo on Monday afternoon, prompting first responders to airlift him to Miami.

The child was in the ocean with his father and sister when the shark attacked him just before 3.30pm Monday near Horseshoe Reef, Key Largo.

A boy miraculously survived a shark bite thanks to the help of his older sister, father, and a nearby dive boat.