Credit: Jill Heinerth
Extreme explorer Jill Heinerth has dived inside pitch-black underwater caves, deep springs, and massive marine sinkholes. Her path to these mysterious spots started years ago. Jill fell in love with water as a fifth-grader, and today, she’s one of the world’s top female divers.
“Exploring the planet’s waters seemed like a chance to go someplace that nobody had gone before,” she explains.
There’s a long list of unexplored water features for Jill to choose from. Almost three-quarters of Earth’s surface is covered with water. Humans have seen only a fraction of its depths.