Could Underwater Caribbean Volcano Threaten US?

Ocean explorers hope the active volcano will unlock secrets to underwater earthquakes and tsunamis.
3:47 | 05/15/14

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Transcript for Could Underwater Caribbean Volcano Threaten US?
We're 6000. Feet under the Caribbean sea in the darkest corners of that kick and Jenny volcano. The mission to save lives by better understanding the mysteries of what causes underwater earthquakes scientists think the menacing -- Jenny. Could cause a deadly tsunami. It's the final 48 hours of -- 150. Day voyage of discovery on -- the exploration -- models with one of the most famous explorers in the world. And I always like to say that my greatest discovery. They want to about the man. Doctor Robert Ballard the man who found the Titanic 121000 feet underwater profiling by. Now he's setting his sights on something new the most dangerous and active undersea volcano just off American shores in the Caribbean. This is the most hazardous part of our planet as we're plates car head on that it is a classic example -- -- in Japan recent. The earthquake. Tsunami affected occurred in. The conditions are so dangerous to man doctor Ballard and his team are relying on Hercules. Of 5000. Pound submersible. To be their eyes and ears inside the volcano. -- The team has already spent five months and see this as the season's final -- and yeah. Line and allowed Erica yes Hercules descends. I join doctor Ballard emissions control -- to watch the live -- -- 6000. Feet underwater. No we can't tell everybody they were in -- yeah we're inside the crater right frequency is surrounded by. -- inside. On its journey Hercules is doing more than taking breath taking pictures. It's collecting samples making maps and even reaching right into the volcano's plume. After hours of searching. A startling discovery. The life. -- that's perfect right there. What could this potentially mean well in this particular case it means that places that we thought there was very little life existing on our planet. We've just opened up a whole another area where life seem to be -- Susan and -- -- from another planet. Not expecting to find life the scientists are hoping that this discovery there's a small blue for better understanding these deep sea habitats. A lot of the DC is sort of like -- -- evidence that desert. We just found an oasis. After a six hour -- Hercules is back on the -- -- reveals its treasures to the scientists on board. Visiting synthetic muscle delegates elected and I am. Larger than when they picked up a couple living out. You can't record Mosul. Fourteen that are right here -- -- Before this what was the largest ever found there. And this and I -- pretty. Doctor Ballard hopes that these and future discoveries will unlock the mysteries of that monster lurking under the -- The -- Jenny volcano. The key is that they're just being full of wonder and wanting to know about -- when we find ourselves when I feel in your eyes. -- to wonder what's over the horizon I -- I just can't wait to know what's over the. For Nightline I'm GO -- -- Aboard the nautilus in the Caribbean sea.

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

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