Up to 11 spacewalks will be required to fully outfit and commission Nauka; the first of these was performed in September 2021. Installation of outfitting equipment In May 2010, outfitting equipment for Nauka was launched, attached to the outside of Rassvet (Mini-Research Module 1) on STS-132 (as part of an agreement with NASA) and delivered by Space Shuttle Atlantis. The equipment, weighing 1.4 metric tons, includes a spare elbow joint for ERA (launched with Nauka) and an ERA portable workpost used during EVAs, the RTOd heat radiator, internal hardware and an experiment airlock for launching CubeSats, to be positioned on the modified passive forward port near the nadir end of the module. Out of these, the outfitting equipment needed for ERA was to be first deployed. After that the radiator and airlock will be deployed. The spacewalkers changed a grapple fixture so the airlock can be used as a base point for the arm, broke torque on bolts that secure the airlock and radiator to Rassvet, removed launch restraints from the radiator, and vented nitrogen jumpers on VKD-55 spacewalk on 17 November 2022. The airlock has a NASA-made FRGF grapple fixture, which was attached to the airlock component carried aboard Rassvet, and used to attach it to the shuttle's Canadarm for passing it over to the station's Canadarm2. The grapple fixture is designed to operate until 2028. The cosmonauts modified this grapple fixture to allow ERA to transfer the airlock from its storage location on Rassvet to the operational position on Nauka'''s forward port and for airlock's use all over the station. The deployable radiator will add additional cooling capability to Nauka, enabling it to host more scientific experiments. The airlock will be used only to pass experiments inside and outside Nauka with the aid of ERA — serving a very similar purpose to the Japanese airlock on Kibo and Nanoracks Bishop Airlock, both on the U.S. segment of the station. The ERA will be used to remove the RTOd radiator and airlock from Rassvet and transfer them over to Nauka''. This process is expected to take several months. Another MLM outfitting is a 4 segment external payload interface called means of attachment of large payloads (Sredstva Krepleniya Krupnogabaritnykh Obyektov, SKKO). It will be delivered in two parts to Nauka by Progress MS-18 (delivered LCCS part, that is, the four part SKKO frame) and Progress MS-21 (delivered SCCS part, that