More than halfway to the Moon and nearly 200,000 miles from Earth, the four astronauts aboard NASA’s Artemis II Orion capsule have encountered an awkward but mission-critical problem: a clogged urine vent line that briefly put the spacecraft’s toilet out of full service. Flight Director Judd Frieling told reporters the issue appeared to be “some frozen urine in the vent line,” a problem that surfaced in the early hours of Saturday as the mission entered Day 3.
Mission controllers spent the morning troubleshooting while the crew — NASA’s Reid Wiseman, Victor Glover and Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen — were asleep. By about 3:30 p.m. ET on Saturday, early in Day 4 of the roughly 10-day mission, engineers had a plan: rotate the Orion capsule so sunlight could warm the blocked line and thaw the obstruction. That maneuver appears to have worked, allowing the system to vent urine to the outside of the spacecraft and restoring limited toilet function.
Controllers subsequently declared the waste-management system “go” for fecal use only, while the urine-handling side of operations remained under observation. The crew also reported a faint burning smell near the bathroom; mission control said the odor was most likely coming from gasket material around the toilet door rather than from an electrical fault. Until full confidence is restored, astronauts are relying on contingency measures to manage liquids.
This is not the first restroom hiccup on Artemis II. Shortly after Wednesday’s launch from Kennedy Space Center, the crew discovered the toilet pump was not operating. That problem proved straightforward: the system needed more water to prime the pump. After adding fluid, the pump began functioning, prompting Christina Koch to quip during a Thursday media call that she was “proud to call myself the space plumber.” The earlier fix and the Saturday thaw show controllers and crew can address plumbing issues on the fly, but the incidents underscore the difficulty of maintaining routine systems in deep space.
While Orion’s toilet separates and vents urine outside the capsule and stores solid waste for return to Earth, the astronauts have contingency options. They have used a collapsible contingency urinal (CCU) and other bag-based techniques that date back to Apollo missions, when crews relied entirely on collection bags — a method later described by astronauts as “distasteful.” NASA and its contractor, Collins Aerospace, have spent years developing Orion’s Universal Waste Management System (UWMS), a program funded in part by a roughly $30 million contract signed in 2015 to adapt the technology for deep-space use.
Toilet troubles are not unique to Orion; spacecraft from earlier programs have had their own hygiene failures. In the 2020s, SpaceX’s Crew Dragon experienced urine-handling issues that forced crews to rely on backup protective garments, and private missions have also faced similar contingencies. Artemis II’s voyage — the first crewed mission beyond lunar orbit in more than five decades — is testing not only propulsion and life-support systems but also the mundane hardware astronauts cannot do without.
For now, mission managers say the immediate blockage has been resolved and the crew can proceed with planned activities, though controllers will continue to monitor the waste-management system as Artemis II completes its outbound leg and carries out a series of tests and observations before returning to Earth.