The renowned cave diver takes readers on “a thrill ride into unfamiliar worlds”—exploring the hidden depths of our oceans and sunken caves (Publishers Weekly). More people have died exploring underwater caves than climbing Mount Everest, and we know more about deep space than we do about the depths of our oceans. In this thrilling firsthand account, Jill Heinerth blends science, adventure, and memoir to bring readers face-to-face with the terror and beauty of earth’s final frontier—and the extremes of human capability. One of the world’s foremost cave divers, Heinerth’s achievements include leading a team that discovered the ancient watery remains of Mayan civilizations and becoming the first person in history to dive deep into an Antarctic iceberg. In Into the Planet, she vividly recounts everything from discovering new species and examining our finite freshwater reserves to the prejudices women face when pursuing careers underwater.