in danger and it was the second such incident since the loss of control of the Nauka on 29 July. On 17 October 2021, Soyuz MS-18 undocked from Nauka, returning Novitsky and two space tourists, actress Yulia Peresild and her producer director Klim Shipenko, to Earth, after spending a week on the station filming the movie The Challenge. On 20 October 2021, Progress MS-17 undocked from Poisk and was placed in chase mode for 24 hours.The Progress MS-17 was the cargo freighter that assisted the crew in many of operations related to Nauka, including providing equipment for integrating Nauka. It redocked to Nauka on 22 October. After the redocking Dubrov and Anton Shkaplerov installed a docking adapter and reopened the hatches to finish loading it with trash from inside Nauka, in preparation for its undocking on 24 November. Integrating with Prichal Roscosmos launched the Prichal Node Module in November 2021. Prichal, expected to outlive the ISS together with Nauka as part of the planned Russian Orbital Service Station, will increase the number of available docking ports on the Russian Orbital Segment by four. As Nauka was designed to be permanently docked to Prichal, its nadir docking port is of the SSVP-M or "Hybrid" standard, which consists of the traditional SSVP-G probe‑and‑drogue soft-dock mechanism and an APAS-95 hard-dock collar. This would make the docking port unusable for Soyuz or Progress flights in case Prichal failed to arrive at the station, because these spacecraft use a slightly different SSVP standard. To ensure the availability of four ports on the segment, Nauka was launched with an APAS to SSVP-G adapter ring. On 25 November 2021, Progress MS-17 undocked from Nauka, taking with it the adapter ring, since Prichal can dock only to a SSVP-M port, not SSVP-G. It was later deorbited together with Progress MS-17 and both burned up on reentry over the South Pacific Ocean. After this, the final visiting spacecraft, Progress M-UM, a modified Progress spacecraft consisting of the usual fuel compartment and propulsion module and Prichal in place of the forward pressurized module, docked to the now exposed SSVP-M port. On 22 December 2021, the Progress undocked from Prichal, freeing the nadir port for docking. A spacewalk on 19 January 2022, connected power and telemetry cables and fluid quick disconnects were mated so Progress and Soyuz ships can transfer fuel to Naukas main tanks. Bringing ERA to functionality Outfitting work