"A little yellow sub is heading beneath the waves ... what will it see on its voyage? There's a sunken shipwreck to spot, wildlife to watch, and colorful coral to explore. What strange things will the submarine see as it dives deeper and deeper? This concertina book folds out to nearly 8 feet, so you can follow the little sub's journey under the sea. Then turn over to learn more about all sorts of submersibles and amazing underwater life."--Page 4 of cover

Cover title.