Aerospace & Defense
Ordinary pressure hulls were steel. Project 661 (also known as the Papa-Class or the K-222 submarine) used titanium alloy, which meant the Soviet Union...
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Ordinary pressure hulls were steel. Project 661 (also known as the Papa-Class or the K-222 submarine) used titanium alloy, which meant the Soviet Union...
K-222 reached 44.7 knots submerged, roughly 51 miles per hour, from two reactors and 80,000 shaft horsepower. No crewed submarine has publicly surpassed it....
The Soviet K-222 (Papa-class) remains a legendary anomaly in naval history: the fastest nuclear submarine ever built. While modern 2026 submarine doctrine prioritizes near-silent...