Appleton, Victor. Tom Swift series

Tom Swift and His Submarine Boat is a novel by Victor Appleton about Tom Swift, a young inventor, and his latest creation, a submarine boat. Tom and his friends are on a mission to find sunken treasure at the bottom of the ocean. They encounter many challenges and obstacles along the way, including dangerous sea creatures and rival treasure hunters. With his resourcefulness and quick thinking, Tom manages to overcome these difficulties and ultimately succeed in their quest for wealth and adventure

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