Secret & unarmed: Top 4 Russian special purpose submarines

Everyone is familiar with Russian combat submarines: the formidable Borei-class carrying out military patrols under the Arctic ice, multi-purpose Yasen-class that can even attacking ground targets, and the silent Improved Kilo-class (Varshavyanka), which can detect the enemy at a distance of hundreds of kilometers.

All of these submarines have modern weapons and are in full combat readiness.

However, the Russian fleet also has unarmed submarines, which are kept under a veil of secrecy.

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