oncite in the watte ewater, it' freedom. >> reporter: for hanna, the calling is out in open waters, switchinge their preservation. >> they are not just blood-thirsty predators. they are fairly intelligent creatures and they are endangered in a lot of areas in the world. shark finning going on, they get stuff in long line fishing. it is the my passion, so, i want to be totally real with it and you can't be a mermaid if you are not going to get in the water with all of the beautiful creatures. >> reporter: so, you have to choose. mermaid or human? >> i want to be a mermaid. you are weightless, you are flying through this beautiful environment with all these incredible creatures. i mean, it's total freedom. it's beautiful. >> reporter: for "nightline," i'm cameron ma think sthison in beach, california. >> wow. thanks to cameron and thank you for watching abc news. we hope you check in with "good morning america," they'll have the latest. jimmy kimmel is next. we are always online at abcnews.com. have a great weekend, america.