The spacewalk began Thursday at 10:51 a.m. and ended at 6:16 p.m. ET, lasting for seven hours and 25 minutes.
The spacewalk continued as scheduled despite the fact that the space station crew was awakened by a fire alarm around 10 p.m. ET Wednesday night. The alarm sounded for a minute after sensors detected smoke in the Russian Zvezda module. The smoke and burning plastic smell was also present in the US parts of the space station.
The crew reacted quickly and replaced air filters and all signs of smoke dissipated, according to NASA. However, the source of the smoke was not identified.
This was the second of what could be up to 11 spacewalks by the cosmonauts as they work on Nauka, a multipurpose laboratory module that includes additional space for research and sleeping quarters.
During Thursday’s spacewalk, Novitskiy and Dubrov installed handrails and completed cable routing work left unfinished during the September 3 spacewalk, which kicked off power and ethernet cable connections for the module. They took photos and installed microbe exposure canisters outside of the module that can help study extreme environments. And they safely jettisoned a cable reel cover away from the space station.
Novitskiy was extravehicular crew member 1 in the Russian Orlan spacesuit with the red stripes, and Dubrov wore the spacesuit with the blue stripes as extravehicular crew member 2.
The outing was the third spacewalk for both Dubrov and Novitskiy, as well as the 243rd spacewalk in support of assembling, maintaining and upgrading the space station.
Meanwhile, a spacewalk scheduled for August 24, which was to include NASA astronaut Mark Vande Hei and Japan Aerospace Exploration Agency astronaut Akihiko Hoshide, will now take place on September 12 — with some changes.
While no further details about this issue — outside of the fact that it was not a medical emergency — have been shared, Vande Hei will now provide internal support during the September 12 spacewalk as he continues to recover.
European Space Agency astronaut Thomas Pesquet will take his place alongside Hoshide. During the walk, Hoshide and Pesquet will install a modification kit that will prepare for future Roll-Out Solar Array installation work.
This will be the first spacewalk conducted out of the orbiting laboratory’s Quest airlock by two international partner astronauts at the space station, according to NASA.
CNN’s Kristin Fisher contributed to this report.