The World's 9 Most Successful Conventional Submarines: #7 Will Surprise You

4. Russian Kilo Class

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One of the most successful export designs in submarine history are the Kilo-class boats. Called "Black Holes" because of their extraordinary silence, these boats mix advanced sonar technology with strong construction. Their double-hull construction guarantees great survivability and lets operations under several temperature ranges. Improved fighting systems, more range, and better noise reduction technologies abound in the most recent Project 636.3 variations. Many navies all around have chosen the class because of its demonstrated dependability and fighting capability.