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About 65 feet (20 meters) down in L\u00fcbeck Bay, along Germany\u2019s Baltic coast, rusting warhead casings supported thick biological growth while nearby sediment remained comparatively sparse.<\/p>\n
Analyzing submersible video from the site, Andrey Vedenin at Senckenberg am Meer<\/a> documented how marine animals clustered across the metal shells.<\/p>\n Most organisms settled on the intact metal rather than the exposed explosive material, concentrating their growth on the structures that offered stable footholds.<\/p>\n That uneven pattern raised a larger question about why these toxic relics still support dense communities, a puzzle explored in the sections that follow.<\/p>\n Dense life on warheads<\/p>\n Across nine warheads, the team identified eight species \u2013 most of them epifauna \u2013 animals that live on underwater surfaces.<\/p>\n Close video showed tube-building worms dominating the shells<\/a>, with anemones, starfish, crabs, and three fish species adding visible cover.<\/p>\n On average, the shells held about 4,000 organisms per square foot, while nearby mud held about 760.<\/p>\n Those numbers put the munitions in the same rough league as natural hard surfaces elsewhere in the bay.<\/p>\n Poison in the plume<\/p>\n Water sampled beside broken warheads carried explosive chemicals at levels that approached or exceeded danger thresholds for aquatic animals.<\/p>\n As the metal corroded, compounds such as TNT leaked into the water and formed concentrated plumes around each source.<\/p>\n One sample reached 2.7 milligrams per liter, close to levels estimated to kill some aquatic life in laboratory tests.<\/p>\n Yet those bursts did not stop dense settlement on the metal, which deepened the puzzle rather than resolving it.<\/p>\n Toxic zones stay bare<\/p>\n The difference between metal and exposed filler was stark, and it helps explain how life persisted in such a hostile place.<\/p>\n Animals that stay fixed in place mostly coated the casing, transport frame, and fuse pockets instead of bare explosive.<\/p>\n Rare starfish and crabs crossed the explosive surface<\/a>, but the yellow material stayed largely free of visible overgrowth.<\/p>\n That pattern suggested water touching the dissolving explosive remained too toxic for most creatures to colonize.<\/p>\n Dumped weapons at sea<\/p>\n These objects were not random scrap, but warheads from V-1 flying bombs dumped during postwar weapons disposal.<\/p>\n Before 1972, throwing unwanted explosives into the sea was common enough that nations later negotiated the London Convention<\/a>.<\/p>\n That practice loaded many coasts with dangerous leftovers whose metal shells have now spent decades rusting open.<\/p>\n What began as a disposal habit ended by creating accidental structure in places where structure had become scarce.<\/p>\n A stripped seafloor<\/p>\n Here, the surrounding bay offered little competition because the bottom was mostly soft sediment rather than rock.<\/p>\n Past removal of natural boulders for construction left few stable footholds, a regional shortage Vedenin described in an interview.<\/p>\n Regular hypoxic (low-oxygen) periods also favored a short list of hardy animals<\/a> over a richer, more varied community.<\/p>\n Those constraints made any stable metal frame disproportionately useful, even when it leaked chemicals into the water.<\/p>\n Ecosystem extends outward<\/p>\n The shells were not the whole story, because other work in L\u00fcbeck Bay found ecological changes extending into the surrounding seabed.<\/p>\n A nearby analysis<\/a> found that abundance and biomass also rose near individual munitions, not only on their surfaces.<\/p>\n Distance from the objects shaped the local community more clearly than explosive compounds in the sediment did.<\/p>\n That finding suggested the metal structures were influencing the neighborhood, not just serving as tiny islands of growth.<\/p>\n Cleanup without collapse<\/p>\n Removing the munitions would reduce a toxic hazard, but it could also flatten one of the bay\u2019s few busy habitats.<\/p>\n That tradeoff is why the authors argued for replacing cleared bombs with safe hard surfaces instead of leaving bare mud.<\/p>\n Concrete modules or restored stone could preserve attachment space without keeping explosive<\/a> chemicals on the seafloor.<\/p>\n The idea would not erase all risk, but it would separate habitat value from the danger source that created it.<\/p>\n Questions after discovery<\/p>\n The dense growth solved one mystery but sharpened another: whether the animals are merely present or actually thriving over time.<\/p>\n Across the southwestern Baltic, at least one explosive compound appeared in nearly every water sample in another survey<\/a>.<\/p>\n That broader chemical backdrop helps explain why the crowded shells still looked improbable to the team.<\/p>\n \u201cWe were prepared to see significantly lower numbers of all kinds of animals. But it turned out the opposite,\u201d said Vedenin.<\/p>\n Implications for marine systems<\/p>\n The Baltic warheads show how quickly life can occupy even toxic leftovers when those leftovers supply something the habitat lacks.<\/p>\n Any cleanup plan will work best if it removes the poison and keeps the structure, treating ecology and safety as the same problem.<\/p>\n The study is published in Nature<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read?\u00a0Subscribe to our newsletter<\/a>\u00a0for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on\u00a0EarthSnap<\/a>, a free app brought to you by\u00a0Eric Ralls<\/a>\u00a0and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"A new study has found that World War II warheads lying on the Baltic Sea floor support far…\n","protected":false},"author":2,"featured_media":335548,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[273,111,139,69,147],"class_list":{"0":"post-335547","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-environment","8":"tag-environment","9":"tag-new-zealand","10":"tag-newzealand","11":"tag-nz","12":"tag-science"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/335547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/comments?post=335547"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/335547\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media\/335548"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media?parent=335547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/categories?post=335547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/tags?post=335547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}