A Revolutionary War-era teen faces self-doubt while helping build the first submarine used in naval combat.It's 1776, and the Revolutionary War is raging. Fourteen-year-old Nathan Wade is a patriot, but he's too young to join the fight. Then his cousin David Bushnell comes to town with a secret. David has designed a water machine that can explode bombs underwater. And his mission is to launch it against the British warships in New York harbor.Nate reluctantl...