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Nauka should, hopefully this year, replace the ISS' Pirs module.

While Nauka is already pretty old, I suspect it will bring a lot of interesting features to the space station. However, Pirs might have some unique capability/features that might not be present in Nauka.

What would they be?

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The DC-1 module (PR name Pirs) provides a crew airlock and a docking port.

The MLM module (PR name Nauka) will not provide a crew airlock. It will provide a scientific airlock along with many other capabilities. It does have a docking port.

The MRM-2 module (PR name Poisk) will still provide the Russian side of the ISS with a crew airlock.

Source: http://www.khrunichev.ru/main.php?id=55

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