Cambridge Discovery Education Interactive Readers are the next generation of graded readers - captivating topics, high-impact video, and interactive exercises designed to motivate and engage. Discover the many mysteries of the sea - shipwrecks and sunken treasure, deep sea creatures and mythical monsters - and how people explore this amazing place. Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Plus, download a free e-book version of the reader!