On this episode of The Spark : Essayist and poet Greg Wrenn has been diving since he was a child growing up in Florida. His new nonfiction book will be what he describes as a, "literary time capsule," describing what it's like to dive amidst the astonishing biodiversity of the reefs of Indonesia's Raja Ampat Archipelago . He wants to write the book, Greg says, because he expects the still-pristine reefs to begin to deteriorate in the next twenty years.