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Jonathan Bird heads to Key West, Fla., and learns to dive without a scuba tank, then heads to Bonaire to explore shipwrecks and coral reefs.
After going to the Bahamas to explore caves, Jonathan Bird travels around the world to learn about sea sponges.
Whitetip reef sharks form gangs to hunt fish on Cocos Island, off the coast of Costa Rica; kelp forests on Catalina Island off the coast of Southern California; shipwrecks in the St. Lawrence River.
Excavating the remains of the Queen Anne's Revenge, the flagship of the pirate Blackbeard; manta rays in Hawaii.