Bonnie Crystal is a 21st century cave explorer and technologist. As an explorer, she carries her unique viewpoint and quest for adventure to the far reaches of the globe; returning back with amazing tales of the unknown, and wonderful images of expeditions into the underground world. Armed with the passion to unlock the mysteries of deep vertical caves, she descends thousand-foot ropes to explore vast chasms inside the earth where no human has gone before. A best-selling author and prolific inventor, Ms. Crystal's inventions have touched our lives with useful technologies to benefit present and future generations.