Event Brief
Sep 12, 2026 at 10:00 AM ET
Russia’s titanium-hulled K-222 submarine design
By The BriefBrief
The Soviet-era Project 661 “Papa-Class” submarine K-222 used a titanium alloy pressure hull instead of steel, requiring new industrial capabilities for alloy production, component forming, and precision welding. The design is described as capable of reaching 44 knots and having two reactors, aimed at hunting US Navy aircraft carriers.
WHO: Project 661 (Papa-Class) submarine K-222
WHAT: A titanium alloy pressure-hull submarine design (Project 661/K-222) is described, including its 44-knot capability and two-reactor configuration.
WHEN: Reported Sep 12, 2026 at 9:25 AM ET
WHERE: Russia
WHY: The article says the goal was to hunt US Navy aircraft carriers.
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