"The Radio Boys Under the Sea" by J.W. Duffield is an exciting adventure novel that follows the exploits of the Radio Boys, Bob Layton, Herb Fennington, and Joe Atwood, as they embark on a thrilling quest to hunt for sunken treasure beneath the ocean's depths. The story begins with the Radio Boys receiving an invitation from an old friend, Captain Spark, who has discovered a lead to a lost treasure ship named the "Golden Galleon." This legendary ship is said to be filled with priceless riches and has been lying at the bottom of the ocean for centuries. Eager for adventure, Bob, Herb, and Joe join Captain Spark's crew on a specially equipped submarine to explore the depths of the sea. As they descend into the ocean, the Radio Boys encounter various challenges, including perilous underwater currents, encounters with marine life, and the ever-present danger of rival treasure hunters. Their trusty radio equipment proves to be invaluable for communication and navigation in the deep-sea environment. Throughout their underwater journey, the Radio Boys demonstrate their bravery, resourcefulness, and problem-solving skills as they search for clues to the treasure's location. Along the way, they uncover the mysteries of the deep and forge strong bonds with their fellow adventurers. "The Radio Boys Under the Sea" is a thrilling tale of underwater exploration, treasure hunting, and camaraderie. It combines elements of adventure, mystery, and the wonders of the deep sea. Readers are taken on an exhilarating ride as they follow the Radio Boys on their quest to uncover the secrets of the "Golden Galleon." The novel not only showcases the excitement of treasure hunting but also highlights the importance of teamwork and the enduring spirit of exploration. It emphasizes the idea that with determination and ingenuity, even the most challenging quests can be undertaken and accomplished. Overall, "The Radio Boys Under the Sea" is an engaging and action-packed addition