Don Winslow of the Navy #65

Don Winslow pilots an X-36 fighter in a dogfight with enemy aircraft, executing a daring maneuver to force the opposing plane into his partner's path and bring it down. The story then shifts to an underwater setting where Don's party discovers a man-made passage and a submarine channel leading to an undersea city. After encountering enemy resistance and an unconscious officer named Pennington, Don and his team navigate through the underwater complex, ultimately discovering a hidden base where they engage in combat with Devilin and his forces, with Don emerging victorious and calling in Navy reinforcements to secure the location.