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The deepest and largest known springs in the world are found in Florida. This book is a guided tour of theese beautiful environments, offering many rare underwater photographs. Beginning with a history of the formation of Florida's springs eons ago and ending with a strong caution on cave diving safety, the reader journeys through these crystal realms, the emphasis always on the natural inhabitants. With many striking photos of these creatures in their natural habitat, this book also serves as a field guide for identification. The photographs represent hundreds of hours of underwater exploration. An appendix offers detailed information on all inhabitants presented. There is a chapter on the saltwater visitors to springs near the sea and a chapter on Florida's most famous -- and most endangered -- marine mammal, the manatee.