During a military training mishap in 1958, a Mark 15, Mod Zero nuclear weapon was lost a few miles from the shores of Tybee Island, Georgia. The bomb was twelve feet long and weighing 7,600 pounds. It's a big bomb, but it was never found. After studying the flight path of the plane that dropped the bomb, weather conditions of the night of the accident and tidal patterns of the last 50 years, a multi agency task force searched the shoals.
The Tybee Island B-47 crash was an incident on February 5, 1958, in which the United States Air Force lost a 3,400 kg Mark 15 hydrogen bomb in the waters off Tybee Island near Savannah, Georgia, USA.