Book 4 of the Tom Swift series opens with our hero's father completing an amazing submarine loaded with high-tech gadgetry in his backyard and ready to enter it into a government competition. Tom, however, discovers through the newspaper that a vessel has sunk containing $300,000 in gold (which was a lot of money back in 1910 when this book was published).
Tom and his friends decide to forgo the government prize of $50,000 to pursue the bigger one - encountering some new villains and despicable characters along the way. Every chapter is a cliffhanger making this audiobook a can't-put-your-earphones-down listening experience. Download and start listening now!