In this book, Granphibian, Wade and Shelby go on a deep-sea adventure in their secret submarine! Can they rescue the dolphins from the dreadful drilling noise? Granphibian and the Diving Disaster is at Oxford Reading Level 8. It is for readers aged 7 to 11 years old who are working below expected standard in their reading. The Readerful Rise series ensures that older struggling readers have books with age-appropriate content and topics, that look like the books their peers are enjoying, but are written at a level they can read successfully.