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Inside the Kilo-class submarine Novorossiysk

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Inside the Kilo-class submarine Novorossiysk

Black hole in the ocean

The Kilo class is the NATO reporting name for a naval diesel-electric attack submarine that is made in Russia. The original version of the vessels were designated Project 877 Paltus (Halibut) in the Soviet Union.

There is also a more advanced version, designated as Improved Kilo-class submarine in the West, and Project 636 Varshavyanka in Russia.These attack submarines are mainly intended for anti-shipping and anti-submarine operations in relatively shallow waters.

Newer Project 636 boats are equipped with improved MGK-400EM, with MG-519 Arfa also upgraded to MG-519EM. The improved sonar systems have reduced the number of operators needed by sharing the same console via automation.

Anechoic tiles are fitted on casings and fins to absorb the sound waves of active sonar, which results in a reduction and distortion of the return signal. These tiles also help attenuate sounds that are emitted from the submarine, thus reducing the range at which the sub may be detected by passive sonar.

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