Scientists maintain that we've only explored 5 percent of Earth's oceans. These incredible expanses contain so many resources that many of us take for granted. Readers of this adventurous guide will be eager to find out how they can be explorers of Earth's final frontier. Whether they're seeking treasure in a wreck or searching for yet-unknown sea creatures, they'll learn what they need to do to prepare for a life in the water. Sidebars and fact boxes highlight information about real-life deep-sea explorers, while vivid photographs capture some truly captivating scenes of the undersea world.