This is Rizikov's second time on the space station and Kud-Sverchkov's first.
Ryzhikov and Kud-Sverchkov wear their Orlan spacesuits and partially depressurise Poisk for a first round of leak tests.
Anxious about telling the two cosmonauts apart? Ryzykov, the current Commander of Expedition 64, will wear the Russian Orlon space suit with red stripes, while Good-Sverkov will wear a space suit with blue stripes.
Kate Rubins, a NASA astronaut who launched the spacecraft from Kazakhstan in October, will help complete the costumes and monitor their progress in spacewalk.
The space walk is estimated to take about six hours.
Two Russian astronauts, wearing huge spacesuits, used the Poisk docking booth on the International Space Station as an airlock for the first time on a Wednesday spacewalk to begin preparing the almost identical Pirs unit for removal next year. The Nauka module will be launched into space next year and will replace the station's old Pirs section.
Astronauts Sergey Rijikov and Sergey Kud-Svershkov are moving along the top of the Russian Zarya module, to the left of the Poisk airlock (extending upward), holding an alternate pump unit.
Poisk launched approximately 11 years ago, on November 10, 2009, and was plugged into the overhead port of the Zvezda unit two days later. Before that, spacewalks were conducted from the Pirs module, which is due to be separated from the ISS and removed from orbit in 2021 to make space for another new module, Nauka.
"We welcome any and all mediums, especially if they have storage space", Rubins said in October.
NASA SpaceX Crew-1 took off from the space station on Tuesday, bringing the total number of astronauts on the station to seven (except one).
Then they closed the hatch and performed additional leak checks before reopening it and floated outside at 11 am straight to begin Spacewalk No. 232 assigned to station assembly and maintenance, the eighth EVA station so far this year. Each crew has to choose their own indicator, according to NASA.
Crew-1 carried NASA astronauts Victor Glover Jr., Michael Hopkins, Shannon Walker, and Japanese Soishi Noguchi to the space station for six months.
NASA's Commercial Crew program could expand the number of astronauts on the space station - which means more science, and even new types of experiments, can happen in the unique microgravity environment.
The seven crew members held a welcoming ceremony on Tuesday. November 2nd celebrated the 20th anniversary of the continuous human presence on the space station.
Previously, the space station hosted about 13 people, but only for a few days when the crew came and went.