A major unexploded ordnance (UXO) incident unfolded in Falmouth last week following the discovery of an American WWII-era aerial bomb in the water near Falmouth Docks.
The device was discovered on Monday 21st September, prompting a significant multi-agency response involving Devon and Cornwall Police, Cornwall Council, HM Coastguard and Royal Navy bomb disposal specialists.
Initially reported as a suspected 250kg device, subsequent assessment identified the ordnance as a 250lb (approximately 115kg) American air-dropped bomb from WWII-era.
Major evacuation and EOD response
Following the discovery, an initial 150m safety cordon was established around the site before being extended as specialist Explosive Ordnance Disposal (EOD) teams investigated and assessed the device.
By Wednesday 23rd September, the exclusion zone had been extended to approximately 755m and a large-scale evacuation was undertaken, affecting over 300+ households and approximately 2,000 residents.
The evacuation operation involved 81 police officers and staff, alongside 100+ volunteers and representatives from partner agencies. Train services between Falmouth Town and Falmouth Docks were also temporarily suspended.
Royal Navy bomb disposal specialists from Bravo Squadron of the Diving and Threat Exploitation Group, based at HMNB Devonport, were tasked with assessing and managing the removal operation of the unexploded bomb (UXB).
Superintendent Ian Thompson of Devon and Cornwall Police praised the response following the operation: “Since the discovery of this 250lb American air-dropped bomb from World War Two on Monday morning, we have seen a display of tremendous partnership working.”
Image showing the exclusion zone setup for the unexploded American 250lb air-dropped bomb discovered in Falmouth Docks.
Bomb safely removed from Falmouth Docks
Rather than attempting to dispose of the bomb in-situ, military EOD specialists carefully moved the device away from Falmouth Docks into deeper and safer waters at Falmouth Bay.
Following its successful removal on Wednesday 23rd September, the evacuation zone was lifted and residents were allowed to return to their homes.
Cornwall Councillor Thalia Marrington described the bomb removal confirmation as “the news everyone wanted to hear”, thanking military specialists, emergency services, council teams, partner organisations and volunteers involved in keeping the community safe.
The bomb was subsequently positioned approximately one kilometre offshore near Gyllyngvase Beach whilst the Royal Navy developed plans for its final disposal.
Schematic drawing of 250lb (approximately 115kg) American air-dropped bomb dating from WWII.
Controlled underwater detonation
Following a six-day waiting period after the device had been moved, Royal Navy specialists returned to complete the disposal operation on Tuesday 29th September.
The delay was an important safety precaution due to uncertainty surrounding the condition of the bomb's fuze and the possibility that movement could have initiated a delayed mechanism.
Before the final disposal could take place, Royal Navy specialists had to allow for a six-day safety period after the bomb was moved offshore. Due to uncertainty surrounding the condition of the device’s fuze, there was a possibility that movement could have initiated the device, and required the bomb to remain undisturbed until the potential activation period had safely elapsed.
Once this precautionary period had passed, Royal Navy specialists returned on Tuesday 29th September to complete the disposal operation via a controlled underwater detonation.
Lieutenant Matt Bowden, officer in charge of Royal Navy Bravo Diving Unit 1, described the final disposal as “a fairly straightforward procedure for us”, despite challenging weather conditions.
The American origin of the bomb also made the discovery noteworthy. Lt Bowden explained: “An American airdrop weapon is quite unique for us, not rare but unique.”
He added that his team had already dealt with four air-dropped weapons during 2026 and more UXBs this year than during the previous five years combined.
A complex multi-agency operation
The Falmouth bomb discovery demonstrates how a single item of UXO can develop into a significant operation involving military EOD personnel, police, local authorities, coastguard teams, emergency services and other supporting organisations.
It also highlights the complexity involved in managing UXO safely. Although the final detonation itself was relatively straightforward for the Royal Navy team, considerable planning and precaution were required before that operation could take place.
The incident follows several significant UXO discoveries across South West England during 2026, including the discovery of a 250kg German SC250 bomb in Plymouth and a 50kg WWII bomb discovered during construction works in Coventry earlier this year.
How can 1st Line Defence help?
Although the circumstances surrounding every UXO discovery are different, incidents such as Falmouth demonstrate that legacy ordnance continues to present a genuine risk more than 80 years after the end of WWII.
At 1st Line Defence, we strongly recommend considering UXO risk during the earliest stages of project planning. Our comprehensive UXO risk management services include desktop risk assessments, technical surveys and specialist on-site support to help protect people, infrastructure and project timelines.
For expert advice on managing UXO risk across your project, contact our team on: +44 (0) 1992 245020 or info@1stlinedefence.co.uk.
