Operation Big Bang was the largest artificial non-nuclear explosion recorded at the time, releasing energy equivalent to 3.2 kilotons of TNT.
Key Facts
- Explosives used
- 7400 tons (6700 metric tons) of surplus WWII ammunition
- Energy released
- 13 terajoules TJ
- TNT equivalent
- 3.2 kilotons kt
- Date and time
- 18 April 1947, 1:00 p.m.
- Executing force
- Royal Navy
- Area destroyed
- Southern tip of Heligoland; northern tip heavily damaged
By the Numbers
Location
Cause → Event → Consequence
Following World War II, Heligoland contained extensive German military bunkers and installations. Allied authorities sought to neutralize these fortifications permanently. The Royal Navy was tasked with demolishing them using large quantities of surplus wartime ammunition gathered from across the region.
On 18 April 1947, the Royal Navy detonated approximately 7400 tons of surplus ammunition placed at multiple sites across Heligoland. The simultaneous detonation released 13 terajoules of energy, constituting the largest artificial non-nuclear explosion up to that point, and was known as Operation Big Bang or British Bang.
The porous sandstone of the island allowed much of the blast wave to dissipate, preventing total destruction. The southern tip was destroyed and the northern tip suffered considerable damage, while the military installations were largely demolished. The event remained a benchmark for large-scale conventional explosive detonations.