According to experts, at the bottom of the ocean, along major trade and transportation routes in the bays and fiords close to the major port cities, lie the remains 6338 ships sunk during the Second world war. If not today, then tomorrow they can become a real threat.
Fuel, diesel fuel, oil, various oils in their tanks and tanks of 400 times greater than resulted, for example, after the accident of the tanker Exxon Valdez in 1989. And it was one of the most devastating for the ecology of the planet disasters.
In critical condition
The main problem is corrosion. It depends on various factors: how deep is the ship from underwater currents, water temperature, degree of salinity... That is, the housing of each of the sunken ship subject to corrosion in different ways. But to stop this irreversible process cannot.
Steel plating is becoming thinner and thinner: depending on the specific conditions from half a millimeter to two millimeters in ten years. A little? But if steel plates are losing from three to ten millimeters thick, they are made unstable, and can crack and leak even with the slightest pressure. This means that many of the remains of warships, lying at the bottom of the sea, are now (or will be in the near future) in a critical condition.
In July 2014, the fuel started to leak from the sunken in 1942, near the North Carolina tanker Hutton, in August 2015 — from the tank to the guided-missile destroyer USS Murphy lying on the bottom of the Atlantic ocean, in October 2016 at a mile flowed oil stain, the source of which was submerged torpedo tanker Coimbra... the United States and the United Kingdom, Sweden and Norway, Poland and Canada, in the water of each of these countries (and not only these) traces of diesel fuel sunken ships.
However, today's technology allows you to raise these ships, even with a fairly great depths or to extort from their fuel tanks, but it costs a lot of money. In the case of an accident in 2012 the cruise liner Costa Concordia all this at a cost of half a billion euros! Preventive ecology — an expensive thing. Almost none of the countries under whose flags floated and fought lying on the bottom of the ships of the Second world, does not dare to invest millions and millions in it to "neutralize" these ships. Do not want — or are unable — to do this, and those States in the territorial waters of which the ships sank.
Just a few kilometers from the beautiful sandy beaches of the Polish coast of the Baltic sea, where every year and the rest over 2 million people, sank in October 1943 the German hospital ship "Stuttgart", which received heavy damage in the attack of U.S. bombers. Over the years, up to 1000 tonnes of heavy oils spilled in the sand of the seabed. The poisoned area is 50 football fields! To neutralize it, one would have to spend tens of millions of euros. But the Polish authorities have nothing concrete to do.
What can you approach this problem completely differently and not wait until a disaster shows the example of Norway. During world war II off the coast of this country, stretching for 20 thousand kilometers, sank more than 900 ships of various size and tonnage. About three dozen of them are considered "particularly hazardous" for the environment.
In 1994, pumped out the diesel from the fuel tanks of the German heavy cruiser "blücher", which was flooded on the roads in Oslo in April 1940 the Norwegian coastal defence. It cost 100 million euros. Since the "neutralized" seven more flooded in time of war ships. Moreover, representatives of the Norwegian authorities emphasize: we must hurry. In 10-20 years the corrosion will eat through the steel plates so that such operations are too dangerous: the steel can crack and then thousands of tons of fuel will fall into the sea water.
In General, it is necessary to seriously do it now, otherwise an ecological catastrophe is inevitable.