and additional suppom laura debonis and scott nathan.tioned by media access group at wgbh access.wgbh.g an >> for more on thiother "frontline" programs, visit our website at pbs.org/frontline. ♪ to order "frontline's"t "the lrvivors" on dvd visit shoppbs, or call 1-800-play-pbs. this program is also available on amazon prime video. ♪ ♪ you're watching pbs. ♪ ♪ -you've said you'd favor middle-class tax cuts. uphe front line is jusere. that's where the river... -she took me out to those wetlands. -i think we're off to a great start. ♪ >> in wartime, you had submarines sinking shipping all along the florida coast. >> boca raton was, basically, a dot on a map. en the army air corps came down to look for sites, they saw this airport, they saw the ocean, they saw how isolated it was, and so they decided this might be the place. >> "drop everything you're doing. come work on this secret war projec" >> they wanted nobody to know what was going on here, an in fact, nobody did. >> it's an astounding story. ♪ [ westminster bells chiming >> the war