In the slightly salty sea off the German shoreline rests a collection of Nazi bombs, torpedoes and naval mines. Thrown off barges at the end of the World War II and neglected, countless explosives have become matted together over the years. They comprise a corroding blanket on the shallow, muddy ocean floor of the Bay of Lübeck in the western tip of the Baltic.
Over the decades, the explosive stockpile was ignored and forgotten about. A growing number of visitors came to the coastal areas and tranquil sea for water sports, kiteboarding and amusement parks. Below the waves, the munitions decayed.
Some of us thought to see a desert, with no organisms because it was all poisoned, explains the lead researcher.
When the first scientists went investigating to see what they were doing to the marine environment, some of us thought they would find a lifeless zone, with no life because it was all contaminated, explains the lead researcher.
What they found surprised them. Vedenin recounts his team members reacting with shock when the ROV first transmitted footage. This was a memorable occasion, he says.
Numerous of sea creatures had established habitats among the munitions, developing a regenerated ecosystem denser than the ocean bottom nearby.
This marine city was proof to the resilience of marine life. Indeed remarkable how much marine organisms we discover in places that are supposed to be toxic and harmful, he says.
More than 40 sea stars had gathered on to one exposed piece of TNT. They were residing on iron containers, detonator compartments and carrying containers just centimetres from its volatile core. Fish, crabs, anemones and mussels were all discovered on the historic weapons. You could compare it with a reef ecosystem in terms of the quantity of creatures that was present, states Vedenin.
An mean of more than 40,000 animals were residing on every meter squared of the weapons, scientists documented in their paper on the observation. The surrounding area was much sparser, with only 8,000 individuals on every square metre.
It is ironic that items that are designed to kill everything are attracting so much marine organisms, says Vedenin. One can observe how nature adjusts after a catastrophic event such as the World War II and how, in certain respects, marine life returns to the most hazardous places.
Man-made structures such as sunken vessels, offshore windfarms, oil rigs and pipelines can create substitutes, restoring some of the lost marine environment. This study shows that explosives could be equally beneficial – the explosion of marine organisms on those in the Bay of Lübeck is probable to be duplicated in other locations.
Between 1946 and the post-war period, 1.6 million tonnes of weapons were discarded off the German coast. Numerous of people loaded them in vessels; a portion were placed in specific areas, the remainder just thrown overboard while traveling. This is the initial instance experts have recorded how marine life has reacted.
These areas become even more valuable for organisms as the oceans are increasingly depleted by fishing, bottom trawling and boat mooring. Shipwrecks and explosive disposal locations practically act as protected areas – they are not official reserves, but nearly any kind of anthropogenic disturbance is prohibited, says Vedenin. Therefore a many of organisms that are typically uncommon or decreasing, such as the Baltic cod, are flourishing.
Anywhere warfare has taken place in the recent history, surrounding seas are often containing munitions, states Vedenin. Many millions of tons of explosive material remain in our oceans.
The positions of these munitions are inadequately documented, in part because of sovereign limits, secret defense data and the reality that archives are stored in old files. They pose an detonation and security danger, as well as danger from the ongoing release of hazardous substances.
As the German government and different states embark on removing these artifacts, scientists hope to safeguard the habitats that have established in their vicinity. In the Bay of Lübeck explosives are already being removed.
We should substitute these metal carcasses remaining from weapons with certain more secure, some harmless structures, like possibly artificial reefs, states Vedenin.
He now aspires that what transpires in the Bay of Lübeck establishes a precedent for replacing habitats after explosive extraction elsewhere – because including the most damaging armaments can become framework for marine organisms.
