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Some of you might have noticed, these incomprehensible black pieces on each substations of the Russia. What is the secret of the mysterious containers that stand in the subway in Moscow, St. Petersburg, Novosibirsk and other cities? Every day hundreds of people pass by them, and few realize that these devices are placed in the domestic subway for the sake of the safety of passengers and employees.

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So, every such black barrel is nothing more than an anti-ambush safe! It is called an explosion-proof container. It is a cylindrical box of thick armored steel, with a splined joint of one of the ends. Most often the upper part has a flat surface.

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A dozen years ago, we knew about it only as a military thing or something used in oil gas and mining industries. Now these are employed not only in the capital city, but also in St. Petersburg, Nizhny Novgorod, Novosibirsk, Yekaterinburg, Kazan and Samara.

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In other words, it is designed for temporary storage of suspicious unattended bags or suspicious backpacks that are placed there before the arrival of emergency services.On finding a suspicious thing, the police, wearing a body armor, take it to the container. Close the container by a special valve after keeping it in a protective armored hull. The unit is fully sealed and it is capable enough to withstand the powerful explosion.

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Today there are about 300 of them in the Moscow metro. They are pretty costly as well.The Moscow metro has about 300 containers and the price of one container is 1.2 million rubles. The service life of not less than 7 years from the date of commissioning

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