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In this context, I mean, a way to get out of the station, without depressurizing the entire station.

The obvious ones are:

  • Quest airlock on Unity (Node 1).
  • Pirs (DC-1) airlock

Does Poisk (DC-2? Or is MRM 1?) have an airlock?

When Nauka launches, the small airlock attached to Rassvet will be moved over.

Kibo (JAXA model) has a small airlock for experiments.

Can either of the 2 PMA's be depressurized and compartmentalized, so that they could be used as an airlock?

CBM ports cannot.

Can any other Russian segment components provide airlock style services?

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Would you count the Transfrer Compartment of Zvezda

Transfrer Compartment of Zvezda

and Pressurized Adaptor of Zarya (each looking like a spherical part of the module)? There even was an official EVA from TC of Zvezda.

MLM Nauka is going to have a a similar spherical compartment. In addition to that a separate airlock for experiments will be provided. See this short 2012 Roscosmos video about MLM. At 4:00 the airlock is demonstrated. Sorry this is all in russian.

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  • $\begingroup$ I would have, except they are now enclosed, by being docked to each other? Or is TC of Zvezda, the aft port? In which casem sure. $\endgroup$
    – geoffc
    Apr 18, 2014 at 1:42
  • $\begingroup$ Well, yes. They'd need to undock all the pendant modules. Think about the ISS not as a celestial palace with fixed configuration, but a swarm of modules moving around each other, undocking and re-docking with each other as needed. $\endgroup$
    – user54
    Apr 18, 2014 at 9:15

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