Just off the coast of Tybee Island, near the city of Savannah, Georgia, rests a Mark 15 nuclear bomb that accidentally plunged into the water in the 1950s when a US Air Force aircraft mishap occurred during a crisis. Submerged on the seabed of Wassaw Sound, the bomb remains in a state of suspense, patiently awaiting discovery – or, in a worst-case scenario, the possibility of detonation.
The cause for concern stems from the unsettling revelation that, contrary to the initial assurances of the removal of the nuclear core, documents have disclosed that it still resides within the device. This implies that the Mark 15 continues to pose a potential threat to the residents of the area.
Mid-air collision over Tybee Island
On February 5, 1958, while performing a simulated combat mission exercise, a Boeing B-47 Stratojet was involved in a mid-air collision with a North American F-86 Sabre. The B-47, having taken off from Homestead Air Force Base, Florida, was carrying a two-man crew, as well as a 7,600-pound Mark 15 nuclear bomb.
The F-86’s pilot, Lt. Clarence Stewart, hadn’t seen the B-47 on his radar and descended directly on top of it. The crash between the two caused the left wing of the fighter jet to completely rip off, while the bomber’s fuel tanks suffered heavy damage. Stewart was able to eject before his aircraft crashed, while the pilot of the B-47, Lt. Col. Howard Richardson, sought the closest landing base. Despite the damages to the bomber, the B-47 remained airborne. After dropping 18,000 feet, Richardson regained control.
As for the nuclear bomb onboard the aircraft, he granted the crew’s request to jettison it, to prevent it from exploding during the emergency landing. The bomb was dropped from 7,200 feet, over the shores of Tybee Island. The pilot and crew reported no explosion upon it meeting the water, and they were able to successfully land the damaged B-47 at Hunter Army Airfield, Georgia.
For his actions, Richardson was awarded the Distinguished Flying Cross.
A search force was sent to find the bomb
The day following the collision, the search for the missing bomb was initiated. This operation engaged the US Air Force’s 2700th Explosive Ordnance Disposal Squadron, along with 100 US Navy personnel. Armed with handheld sonar devices and employing cable sweeps, the search persisted for nearly 10 weeks.
On April 16, the military announced their inability to locate the explosive device.
Several decades later, in 2001, the Department of Energy conducted a hydrographic survey of Wassaw Sound, revealing that the Mark 15 was likely buried beneath a layer of silt at a depth ranging from five to 15 feet. The military subsequently acknowledged this as the probable location of the explosive.
Was the Mark 15 nuclear?
Since its disappearance, there’s been an ongoing debate regarding the nature of the missing weapon – whether it was nuclear or not. If it possessed a plutonium core, it would be deemed a fully functional nuclear device. Alternatively, if the core was replaced with a dummy, it would be non-nuclear, but still capable of generating a conventional explosion.
The US Air Force provided assurance that the Mark 15’s “nuclear capsule” had been removed before the flight and replaced with a simulated 150-pound cap made of lead. Supporting this claim, documents from the Strategic Air Command emphasized that test flights in February 1958 weren’t authorized to carry bombs with nuclear capsules.
For a considerable period, this explanation was widely accepted. However, in 1994, a previously classified document containing the transcript from the 1966 Congressional testimony of then-Assistant Secretary of Defense W.J. Howard was declassified, revealing a contradiction to the Air Force’s assurances over the years.
During his testimony before the US Congressional Joint Committee on Atomic Energy, Howard admitted that the Mark 15 was a “complete, fully functional bomb with a nuclear capsule,” housing a plutonium trigger. If Howard’s testimony holds true, the bomb could still inflict significant damage on the surrounding area if detonated. The explosion would involve a fireball extending over a mile and thermal radiation detectable up to 10 miles in all directions.
Yet another search is launched
With this new information, Air Force veteran Lt. Col. Derek Duke privately conducted a new search for the missing nuclear bomb in 2004. He and his team trawled the Wassaw Sound area and measured the levels of radiation in the water with a Geiger counter.
Their search discovered that, near the top of Tybee Island, there were levels of radiation four times higher than naturally-occurring radiation, suggesting that, if the bomb were nuclear, the Mark 15 was located nearby. By finding out where the radiation levels were elevated, they were able to map out and triangulate an area about the size of a football field.
However, a further investigation into the area by the Air Force determined that the higher levels of radiation were naturally occurring, the result of the natural deposits of monazite in the sand. As such, the location of the missing Mark 15 remains a mystery.
Best to leave the nuclear bomb alone
The Air Force is content with leaving the bomb’s location a mystery, and officials have assured residents in the surrounding area that it poses no threat, so long as it’s left alone. An “intact explosive would pose a serious explosion hazard to personnel and the environment if disturbed by a recovery attempt,” they stated.
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The next time you go diving near Tybee Island, keep an eye out for the 12-foot long, 7,600-pound Mark 15 nuclear bomb with the serial number 47782. If you spot it, leave the sleeping beast alone!