"At last he lowered the sub and climbed aboard. He felt a bit guilty, but mostly he felt like James Bond. He could see himself piloting the sub through the ocean, exploring the deep. Maybe he could even find some old pirate treasure..." When Jake visits his dad on a deserted tropical island and finds they have a submarine, all he can think of is taking it down to explore the ocean. But if he does, will he make the discovery of his life, or the biggest mistake ever? Unlike Jake, Cori has spent his entire life in the greatest depths of the ocean, but he's never explored it either, so he's...