The darkest, deepest reaches of the oceans are home to some of the only places on Earth that remain unexplored by humans.

Calling All Innovators series introduces students to careers in science and technology. The complex text allows readers (Grades 5-8) to determine the main idea and explain how it is supported by key details.

Readers will find out how researchers and engineers are working to map out these mysterious depths. They will also learn how humans first began exploring the planet's oceans and how sea exploration has changed over time.