The UK government has completed the removal of all three masts from the SS Richard Montgomery, a World War II American cargo ship that has lain in the Thames Estuary near Sheerness, Kent, since 1944, with approximately 1,400 tonnes of wartime explosives still aboard.
Maritime minister Keir Mather confirmed the project's completion on October 19, 2026, saying the operation had finished ahead of schedule and below forecast costs. The work was designed to reduce structural pressure on the deteriorating wreck and prevent the masts from potentially collapsing into its cargo holds.
However, removing the masts has not eliminated the explosive hazard. In its official completion statement, the Department for Transport confirmed that monitoring, maritime exclusion-zone controls and restrictions on aircraft flying near the site will continue.
Why the SS Richard Montgomery's Masts Were Removed
The three steel masts had stood above the water for more than eight decades, becoming familiar landmarks in the Thames Estuary. Their continuing weight placed stress on the aging ship's structure, while their possible collapse raised concerns about further damage to the wreck and its remaining cargo.
An expert advisory group recommended removing the masts to address those structural risks. The government subsequently developed a specialist engineering operation intended to protect the wreck during the work.
Under the plan announced on July 14, 2026, marine salvage contractor Resolve Marine was appointed to carry out the operation. The approach involved constructing an underwater working platform so engineers could cut the masts below the waterline.
The project received £9.5 million in announced government funding. Although ministers confirmed that the work finished below forecast costs, the October 19 statement did not provide a final expenditure figure.
The Department for Transport said the operation involved cooperation with the United States Maritime Administration, specialist contractors and local partners. Its successful completion removes one identified source of structural stress, rather than resolving every concern associated with the wreck.
How a World War II Ship Became a Long-Term Hazard
The SS Richard Montgomery was a US-built Liberty ship constructed in Jacksonville, Florida, in 1943. It was carrying munitions intended to support Allied operations in Europe when it arrived in British waters the following year.
On August 20, 1944, the vessel dragged its anchor and grounded on a sandbank near the Medway Approach Channel while awaiting onward passage across the English Channel.
According to the Maritime and Coastguard Agency's historical account, the ship had originally been loaded with approximately 7,000 tons of munitions. Salvage crews began unloading the cargo, but a crack developed in the hull and the vessel started flooding.
By September 25, 1944, roughly half the original cargo had been removed. The salvage operation was abandoned after the ship flooded completely, leaving explosives trapped in its forward holds.
The government now estimates that approximately 1,400 tonnes of explosives remain. That figure refers to the remaining explosive material, not the ship's original munitions cargo.
Since the sinking, the wreck has been subject to surveys and protective controls. Its location close to an important shipping approach has made long-term monitoring particularly significant.
Could the Remaining Explosives Still Detonate?
The central concern is that the SS Richard Montgomery continues to contain unexploded wartime ordnance inside a structure exposed to decades of corrosion, tides and other environmental forces.
The Maritime and Coastguard Agency has described the likelihood of a major explosion as remote, while recognizing the need to monitor the wreck's condition. Its assessments have identified gradual deterioration alongside findings that the wreck has remained broadly stable.
Historical assessments have examined potentially serious consequences if a large quantity of the remaining explosives detonated. As The Guardian reported on October 19, concerns have included possible extensive damage around Sheerness and large waves affecting surrounding waterways.
Those scenarios should not be confused with predictions that an explosion is imminent. The precise consequences would depend on factors including the condition of the munitions, the quantity involved in any detonation and the physical circumstances of the event.
The completed mast removal addresses a specific potential trigger: structural damage caused by the masts' weight or collapse. It does not establish that the remaining explosives are harmless, nor does it provide a new numerical estimate of the overall probability of an explosion.
What Happens to the Wreck Now?
The Department for Transport says the SS Richard Montgomery will remain under continuous monitoring and within its established exclusion zone. Restrictions on flying in the vicinity of the site also remain in force.
The wreck is protected under the Protection of Wrecks Act 1973. The Maritime and Coastguard Agency has described arrangements involving navigation buoys, radar surveillance and regular technical surveys to identify changes in the wreck or surrounding seabed.
The three recovered masts and associated artifacts have been transferred to the Historic Dockyard Chatham for conservation. Their preservation will retain a physical link to the vessel's wartime service and the maritime history of the Thames and Medway estuaries.
The October 19 announcement did not establish a new timetable for removing the explosives still aboard the ship. Instead, the government's immediate position is to continue managing the remaining hazard through monitoring, access restrictions and specialist oversight.
The mast-removal project therefore marks a significant safety improvement for one of Britain's most closely watched shipwrecks. But the essential distinction remains: the dangerous cargo is still beneath the Thames Estuary, and its long-term management continues.
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