Searching for Monstrous Sharks Near Cuba, Caribbean's Final Frontier

Recent political thaw is allowing Cuban and American scientists to team up, reportedly for the first time ever.
3:18 | 07/08/15

Coming up in the next {{countdown}} {{countdownlbl}}

Coming up next:

{{nextVideo.title}}

{{nextVideo.description}}

Skip to this video now

Now Playing:

{{currentVideo.title}}

Comments
Related Extras
Related Videos
Video Transcript
Transcript for Searching for Monstrous Sharks Near Cuba, Caribbean's Final Frontier
Finally, tonight, it's called the gardens of the queen, but this is no place for a tea party. It's home to some of the largest sharks on Earth, and tonight, the explorers who went in there with no protection. Reporter: These men are in dangerous waters, searching for legendary beasts. The recent political thaw between Cuba and America allowing scientists to team up for the first time ever in search of the largest sharks on Earth. In fact, these waters are where the largest shark on record was caught. A great white said to be over 21 feet and weighing over 7,000 pounds. Could sharks like this really exist here? Could they really be this big? We're here and we're going to head down here to the gardens of the queen. Reporter: A mission leads them here to the gardens of the queen, called the final frontier of the caribbean, this marine ecosystem is untouched by American researchers. ? This sh a very important place in the garden of the queen. This is a spot where we have catch the largest number of shark. Reporter: They plan to attach the sharks' monitors. It is risky. Anything could go wrong. ? We're not going to have the gear to stop something like a 21-foot great white shark. We don't have any cages. We know that's part of the reality on this expedition. That we're going to have to jump in and not know exactly ha it is we're going to see. Reporter: They dive in with nothing to protect them. At least a dozen sharks. Some of the biggest I've ever seen. Look at that. That is a big mama. That's a big female. Oh, another one. Reporter: Watch as the team tags this massive 19-foot silky shark with their bare hands. I did it! They did it! Reporter: Next they journey north to the same waters in which el monstro once swam. Finally, the call they've been waiting for. One of the boats has hooked an exceedingly rare long-fin maico. It's a long-fin maico! All right! Look at that beauty! You got it! Reporter: They catch him. There you go. Reporter: Tag him. Good job, good job! Reporter: And cut him loose. Get ready. More slack! Away, going to swim? All right. There you go, man. Nice. So 70 years after el monstro was caught, we can confirm that this is clearly a place where big sharks come. Reporter: The mission, a success, a partnership born, a question not if but when the next one will appear just beneath the surface. Only improving my affection for dry land. Shark week airs on discovery on

This transcript has been automatically generated and may not be 100% accurate.

{"duration":"3:18","description":"Recent political thaw is allowing Cuban and American scientists to team up, reportedly for the first time ever.","mediaType":"default","section":"ABCNews/Nightline","id":"32291751","title":"Searching for Monstrous Sharks Near Cuba, Caribbean's Final Frontier","url":"/Nightline/video/searching-monstrous-sharks-cuba-caribbeans-final-frontier-32291751"}