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the reality : Air-independent propulsion (AIP), or air-independent power, is any marine propulsion technology that allows a non-nuclear submarine to operate without access to atmospheric oxygen (by surfacing or using a snorkel). AIP can augment or replace the diesel-electric propulsion system of non-nuclear vessels.
Air-independent propulsion - Wikipedia
en.wikipedia.org
And all nuclear submarines have air-independent propulsion. Most of Russia's subs are nuclear powered and thus AIP.