Project 636.3 Varshavyanka: Inside Russia’s Stealthiest Non-Boomer Sub

Some naval strategists see the 21st century as the era of the nuclear-powered sub, with the United States doing away with diesel-electric boats entirely in the 1990s. Russian engineers hold a different view, and have proven time and time again that non-nuclear subs have more than enough 'stealthiness' to hold their own against entire NATO armadas.