What is the technology of the last Chinese "open air" waterboarding?

This is a sterling engine, a system LOX? Is it a diesel right? Is this the main propulsion system or simply a small auxiliary? Of course, I am not referring to their nuclear submarines. No Responses pretty please. China recently announced an "air dependent" diesel technology. I speak not to its nuclear submarines, but the new technology, whatever. Not There are nice answers please.

What does "nuclear submarine" because it does not need to surface for propulsion systems. EDIT: Well, you mean independent or dependent air in the air? You keep changing your story. Depending on the air is a classic diesel submarine.

Advanced Technology Makes Diesel Engines Quieter and Smoothe

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