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Jonathan Gruber and Lindy Warren lead a team exploring Roatan's coral reefs.
The Bird Family goes on a February vacation to the Turks and Caicos Islands for some scuba diving, horseback riding and beach fun; on a dive with Big Blue Collective, they search for Jojo the famous wild dolphin.
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.
Diving with sea lions in the Galapagos Islands; training sea lions at the Mystic Aquarium in Connecticut; humpback whales in Silver Bank, Dominican Republic.
A sinkhole in the Yucatan is more than 100 feet deep; diversity of sharks; how animals protect themselves.
Jonathan Bird travels to the Riviera Maya to experience cave fish, then heads to Australia with the Palm Beach dive team to find an unusual fish.