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Deep water enthusiast Jonathan Bird passes a scuba diving test with Zac Petersen.
Jonathan explores Lake Champlain, the 13th largest U.S. lake, using a World War II landing craft.
Jonathan Bird investigates the underwater world, finding manatees and renting scuba tanks.
The waters of Manuk, a tiny volcanic island in Indonesia, brims with thousands of venomous sea snakes; manta rays gather for just a few weeks each year at a remote atoll in the Maldives.
Bull sharks in Mexico; astronauts train for space walking in a giant pool at NASA's Neutral Buoyancy Lab in Houston.
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.
Biologists work to save sturgeon in the St. Lawrence River; coral grows in an underwater farm in Key Largo, Fla.
Beluga whales at the Mystic Aquarium in Connecticut; a blue hole on Andros Island in the Bahamas is over 400 feet deep; spinner dolphins in Hawaii.
Aquarius Reef Base, an undersea lab in Florida; skates and rays, including the plankton-eating manta ray and the electric torpedo ray.
After going to the Bahamas to explore caves, Jonathan Bird travels around the world to learn about sea sponges.