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Bestsellers
Underwater Exploration
Non-Fiction
Adventure
Marine Biology
Oceanography
Thriller
Treasure Hunt
Common themes among these books include underwater exploration, adventure, treasure hunting, danger, sea creatures and their habitats, sunken ships and artifacts, and preventing catastrophic events. Many of the books feature teams of experts or adventurers working together to accomplish a mission or solve a mystery. The Octonauts are a recurring theme in several of the books, as is Dirk Pitt. The Titanic is also a common topic, with multiple books exploring its history and discovery. There are both fiction and non-fiction books represented in this list.