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Meet the K-222: The fastest nuclear submarine in history capable of exceeding 44 knots (made in Russia)

Summary and Key Points: Built under Project 661 “Anchar,” the K-222 (Papa-class) remains the fastest submarine in history, hitting a record 44.7 knots submerged. -Designed as a “carrier killer” to ...
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The Soviet Union's K-222 'Titanium Monster' and its unbroken record.

The K-222 submarine (Papa-class), built by the Soviet Union as part of Project 661 “Anchar”, still holds the record for the world's fastest submarine, reaching a speed of 44.7 knots while submerged.