Submarine Project 615-Quebec class Free 3D model

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The "cigar box" submarines of the Soviet Navy made history with their revolutionary propulsion system. This cutting-edge design boasted an air-independent Kreislauf-type system, which had been under development since the 1940s in secret Soviet labs. The Redo engine proved to be a game-changer after Germany's advanced technologies fell into Soviet hands following World War II. With its external starter system, scrubber to neutralize CO2 exhaust, and return-oxygen circulation method utilizing liquid oxygen, this innovative system propelled these underwater warriors at speeds that would put many larger submarines to shame. Yet the use of LOX as a component introduced fresh concerns, given its known volatility and vulnerability to high-temperature environments near live electrical wires, earning them a nickname among sailors: "torpedo boxes".