Tom Swift and His Submarine Boat; Or, Under the Ocean for Sunken Treasure (PDF)

Tom Swift and His Submarine Boat, or, Under the Ocean for Sunken Treasure, is Volume 4 in the original Tom Swift novel series published by Grosset & Dunlap.

Tom Swift's father has been working diligently on a secret project, which he reveals at the beginning of the book as a submarine. With the submarine, named the Advance, he plans to enter a contest for a government prize of $50,000. While in New Jersey to launch the submarine, Tom reads in a newspaper that a ship named the Boldero sank off the coast of Uruguay during a storm, taking down with it the sum of $300,000 in gold bullion.

Tom persuades his father to pursue this treasure as opposed to competing for the government prize. While picking up a hired sea captain, Tom's plans are overheard by a contestant in the government contest, and a rivalry for the treasure begins. The other submarine, named the Wonder, soon sets off to follow Tom and his crew after they embark on their journey.

Tom's crew consists of Tom Swift, his father, Mr. Sharp, Captain West, and Mr. Damon. Each of these take chores on board, including Mr. Damon, who seems to be the cook of the voyage.

The submarines hold up at an island to resupply, and during the night, the Advance tries to slip away from the Wonder. Tom knows that the Wonder and its crew is not certain of the location of the wreck, and is merely following the Advance, hoping to steal the treasure at the last moment.

After the Wonder tries to ram the Advance, Tom and his father take to the heavy underwater cannons, and successfully disable the Wonder, leaving her damaged and immobile. Tom and the Advance seize the opportunity to push ahead.

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