Russias's Sierra II-Class Has Titanium Twin-Pressure Hulls the U.S. Navy Can't Match

Summary: The U.S. ceased domestic production of titanium sponge by 2020, now heavily reliant on imports, predominantly from Japan. Titanium's strength-to-weight ratio has made it popular in consumer products and critical in military applications. Soviet Russia innovated in its use, constructing submarines like the Sierra II-Class with titanium hulls to enhance depth capabilities and reduce detectability.

-The U.S., despite using titanium in the SR-71 aircraft, never pursued titanium-hulled...