USS Macon
Launched by the U.S. Navy in 1933, the airship USS Macon was one of the largest flying machines in history, but after just two years of service, disaster struck. The Macon would be the nation's last great airship. The final resting place of the Macon stayed hidden for more than 55 years, until researchers discovered its remains nearly 1,500 feet below the surface of Monterey Bay National Marine Sanctuary in 1990.