Classicly

The Submarine Boys and the Spies Dodging the Sharks of the Deep is a juvenile fiction story written by Victor G. Durham, best known for his Submarine Boys series of 7 novels.

Excerpts:

The thousands of tourists, hotel guests and cottagers at Spruce Beach had been promised that by the middle of December they would have a treat the like of which few of them had ever enjoyed before. The Pollard Submarine Boat Company, so named after David Pollard the inventor—the company of which Jacob Farnum, the shipbuilder, was president—had promised that by that date their newest, fastest and most formidable submarine torpedo boat, the "Benson," should arrive at Spruce Beach, there to begin a series of demonstrations and trials.