Tom Swift and His Submarine Boat or Under the Ocean for Sunken Treasure

Tom Swift's father has been hard at work on a secret project. At the beginning of the book, he revealed that it was a submarine. He plans to take a submarine called the Advance to enter a competition to compete for a government prize of $ 50,000. When Tom launched a submarine in New Jersey, he read in the newspaper that a ship named Boldero sank off the coast of Uruguay in a storm and took $ 300,000 worth of gold bars. Tom convinced his father to seek wealth rather than compete for government bonuses.