the Naval Academy. The opening of the story introduces us to Jack Benson and his fellow submarine boys, Hal Hastings and Eph Somers, as they anticipate the arrival of a naval crew to take possession of their submarine, the "Pollard." Their excitement grows when they learn that they will journey to Annapolis to instruct midshipmen on how to operate the submarine. However, an unexpected twist occurs when the second submarine, the "Farnum," mysteriously disappears from its moorings. This sets off a chain of events that heightens the stakes for the young boys, hinting at both adventure and potential danger in their quest to utilize their skills and knowledge in the service of their country. The stage is set for a thrilling exploration of the trials they will face and the camaraderie they share. (This is an automatically generated summary.)