Losharik (AS-12 or AS-31)

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It is a highly advanced Nuclear powered submarine of Russia.
This week a fire accident was reported on the submarine within the Russian territorial waters.
It is a deep-diving special missions ship, operated by the Russian Navy.
It is capable of withstanding high pressures at great depths, enabling it to survey the ocean floor.
It’s interior hull is built using titanium spheres which makes the vessel dive up to 6000 metres. A regular submarine can go to the depth of only 600 metres.
It is generally carried under the hull of a larger submarine and is capable of releasing a smaller submarine itself.
According to Russian military the submarine was carrying out ‘bathymetric measurements’ or underwater mapping.
But the the US and its allies feared that Russia might be developing new, secretive ways to tap or even cut undersea Fiber-optic cables that carry transatlantic Internet traffic.
In recent years, U.S. and British military officials have warned that Russian submarines have been spotted close to the cables.