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.