Throughout history, people have always explored new frontiers. Adventure, fame, and scientific discovery have all driven humans to forge into the unknown. This title examines exploration under the sea. Easy-to-read, engaging text takes readers to deep ocean trenches, examines the explorers who journeyed to these strange, fascinating areas, and traces the development of the technology and techniques that made this exploration possible. Well-placed sidebars, vivid photos, helpful maps, and a glossary enhance readers' understanding of the topic. Additional features include a table of contents, a selected bibliography, source notes, and an index, plus a timeline and essential facts. -- From the publisher.

Aligned to Common Core Standards and correlated to state standards. "Essential Library" -- Back cover.

Earth's deepest spot -- Ancient quests -- Evolving underwater craft -- Submersibles and scuba -- Navy interest and exploration -- Race to the bottom of the sea -- New understandings of the deep sea -- Technological advances -- Modern deep-sea exploration.