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BOLTENHAGEN: Slowly, Dirk Schoenen dives down to a huge pile of ammunition from World War II at the bottom of the Baltic Sea. He removes some of the top pieces and carefully puts them into a basket, as a team of engineers, divers and seamen watch his every move on monitors streaming live video from a camera attached to his head.
After an hour, the men pull Schoenen back up onto the Baltic Lift, a mobile platform located 6 kilometers (3.7 miles) off the small town of Boltenhagen on the German coast. He has recovered several 12.8cm- shells, some of them still inside a broken wooden box, fragments of smaller grenades, and several 2-centimeter projectiles.
His bounty was fruitful but humble compared to what’s left on the sea floor.
Approximately 1.6 million tons of old ammunition are lying on the bottom of the North Sea and Baltic Sea, posing a considerable danger: their casings are slowly rusting and emitting toxic substances such as TNT compounds.
Europe cleans up the mess of WWII as new conflicts with Russia loom
As tensions between Russia and NATO build up on the Baltic Sea, with near daily incidents involving sabotage of undersea cables,NATO fighter planes scrambling to push Russia military planes away, and hostile drones from the East invading western airspace, Europeans are still busy cleaning up the mess that World War II — and to a smaller extend World War I — left behind in the ocean.
Most of the ammunition was deliberately sunk in the ocean after the war because the Allies were concerned that Germans would resume hostilities against them again at some point, and ordered that Germany destroy all ordnance. At the time the easiest way to do so seemed to be to simply dump everything into the sea.
Trains from all over Germany were sent to the coasts in 1946, and fishermen were commissioned to take the material to designated disposal areas in the Baltic and North Seas. Often, however, they also threw the ammunition elsewhere into the ocean, and strong currents, especially in the North Sea, have spread the ordnance all over the seafloor.
In an effort to clean up the seabed from the remains of war, the German government has given 100 million euros ($117.4 million) to teams of divers to study how to best recover the ammunition, and to engineers to come up with long-term plans on how to rid the oceans of it.
The current four-week pilot project started last month on the Baltic Lift platform — a self-propelled crane barge temporarily moored off Boltenhagen because experts had discovered a large field with around 900 tons of old ammunition there.
Two teams of divers are working in 12-hour-shifts around the clock. It’s too dangerous to bring the rotting pieces up on the platform, so they are initially sorted and stored in baskets under water until a special ship takes them ashore. Only then are they taken to facilities specializing in disposing old ammunition.
Risks of spontaneous explosions and contamination
“This isn’t a routine job,” said Schoenen, 60, who has been diving since 1986 and volunteered for the Baltic Taucher diving team.
“The challenge, of course, is that you never know what you’re going to get,” he said as he stripped out of his diving gear, including three pairs of gloves to ensure his skin did not come into direct contact with the ammunition. “Most of these things can be handled, but you mustn’t neglect caution and just randomly hit something or throw something away.”
The rotting ammunition isn’t just contaminating the water — it can also explode as the detonators of sea mines and unexploded aerial bombs become increasingly sensitive over time. That is a rare occurrence.
Even worse, the 80-year-old ammunition is also starting to poison the marine environment: decaying fragments of TNT explosives, which are considered carcinogenic, have been discovered in the water close to old ammunition lying on the seabed. Substances derived from the explosives have been found to accumulate in marine life such as mussels and fish, according to the German environment ministry which is spearheading the clean-up efforts.
While the levels of toxic substances detected were well below safety thresholds for drinking water or for marine organisms, in some cases “concentrations approached critical levels,” the GEOMAR Helmholtz Center for Ocean Research Kiel said in a study published in February.
The research institute highlighted “the urgent need for munitions clearance to minimize long-term risks.”
The problem is especially pressing in the Baltic Sea because of the narrow channel connecting it to the nearby North Sea and the Atlantic, which means the polluted water doesn’t circulate out of the area for decades, according to the German environment ministry.
Other countries are dealing with similar problems
The government project doesn’t just focus on cleaning the sea floor. The long-term goal is to find safe ways to recover and immediately destroy the ammunition, ideally by automated means without the help of human divers, and by burning the toxic material on a floating industrial plant at sea.
The current project and three related government-sponsored projects last year that used underwater robots to screen the seafloor will help determine how such offshore facilities should be designed, said Volker Hesse, a marine engineer coordinating the program.
Hesse stressed that the findings are not just important for Germany but also of great interest to other countries because old ammunition sunk in the sea is a growing problem around the world.
He noted that the Black Sea is also facing the problem of contamination by ammunition from Russia’s war on Ukraine.
“This is definitely a global problem — one only has to think of the crises in Vietnam or Cambodia, but also here locally in the neighboring countries, the Baltic Sea, Denmark, Poland,” he said.

MADRID: Spanish Prime Minister Pedro Sanchez on Monday reiterated his “deep admiration” for pro-Palestinian protesters who forced the final stage of the Vuelta cycling race to be abandoned over the weekend.
He also said Israel should be barred from international sporting competitions “as long as the barbarism continues” in Gaza, like Russian sport teams were penalized after Moscow’s invasion of Ukraine.
Despite sharp criticism from the main opposition conservative Popular Party (PP), Sanchez has maintained his stance, as he sought to position himself as a leading European supporter of the Palestinian cause.
“Our position is clear and categorical: as long as barbarity continues, neither Russia nor Israel should participate in any international competition,” the Socialist premier said.
Around 100,000 protesters were present for the final stage of the race on Sunday which was due to finish with several loops in Madrid, but was cut short around 60 kilometers before the finish in the Spanish capital.
Protesters were denouncing the participation of the Israel-Premier Tech team in one of cycling’s major races
The team, owned by Israeli-Canadian property developer Sylvan Adams, is a private outfit and not a state team that has been hailed by Israeli Prime Minister Benjamin Netanyahu for continuing to compete despite the vehement protests.
On Sunday protesters pushed over barriers and stood in the road where cyclists were due to pass in various places along the route.
After the stage was scrapped, they chanted: “Palestine won this Vuelta.”
Police had initially intervened at another point along the route, but ultimately allowed the protesters to occupy the roadway peacefully.
The leader of the main opposition PP party, Alberto Nunez Feijoo, wrote on X late on Sunday that “The government has allowed and induced the non-completion of the Vuelta and, in this way, an international embarrassment televised worldwide.”
“The head of government is proud of the actions of a few who, in support of Gaza, threw barriers at the national police... Not me. I defend freedom of expression as long as it does not involve violence or public disorder,” he added.
The unrest was the culmination of pro-Palestinian protests that disrupted the three-week race on several occasions.
Even before the final day, race organizers had to shorten some stages and demonstrators had caused crashes after bursting onto the course.