Four NASA volunteers sealed in a 3D-printed Mars habitat for a year walk out Oct. 31

Four volunteers have now spent a full year inside a 3D-printed Mars habitat at NASA’s Johnson Space Center in Houston, and they are scheduled to walk out on Saturday, Oct. 31, 2026. They went in on Oct. 19, 2025, for a planned stay of 378 days. Their names are Ross Elder, Ellen Ellis, Matthew Montgomery and James Spicer. Counting from the Oct. 19, 2025 entry, the 378 days run out on the Oct. 31 exit, which NASA has set for a Saturday and plans to mark with a livestreamed egress ceremony.

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The crew of CHAPEA Mission 2

The experiment is called CHAPEA, short for Crew Health and Performance Exploration Analog, and this is its second mission. Elder is the mission commander, Ellis is the medical officer, Montgomery is the science officer and Spicer is the flight engineer. NASA’s Human Research Program, the office that runs the study, marked the one-year point on Oct. 19, 2026, with a release titled “NASA’s Simulated Mars Crew Marks One Year Inside Habitat.”

Nothing about the setup is meant to be comfortable. NASA says the crew has grown crops, managed limited resources, dealt with communication delays and performed suited spacewalks on a simulated Martian surface. Messages to and from the outside world travel with a Mars-like lag of up to 45 minutes each way, and the volunteers’ families could reach them only by email, so every conversation with home is delayed and written.

Researchers study how the four adapt to stressors that real Mars explorers would face, including limited resources, prolonged isolation and equipment failures, according to NASA’s CHAPEA Mission 2 page. Daily life includes simulated Marswalks, robotic operations, habitat maintenance, exercise and crop cultivation, so the schedule resembles a working expedition more than a quarantine. The findings are meant to inform future protocols for crewed Mars missions, and the one-year mark gave NASA a natural moment to say what the crew has completed so far.

Inside the 1,700-square-foot printed habitat

The structure is about 1,700 square feet. NASA’s habitat page says ICON’s Vulcan construction system printed it from a material called lavacrete, and adds that 3D printing could reduce the building materials a future mission would have to launch from Earth. Inside are four private crew quarters, dedicated workstations, a medical station, common lounge areas and a galley with food-growing stations.

Four people sharing 1,700 square feet is the confinement the study is built around. Individual quarters give each volunteer a private space, while the galley, the lounge and the workstations are the places where the group works and eats together. The food-growing stations in the galley connect to the crop cultivation NASA lists among the crew’s routine tasks.

What happens when the hatch opens on Oct. 31

NASA says the crew will exit on Saturday, Oct. 31, and then begin two weeks of post-mission evaluations and debriefs with agency scientists. An egress ceremony is planned to be livestreamed on the day. Science teams are already processing the health and performance data collected during the year.

The agency expects that data to inform food and exercise systems, spacewalk planning on Mars, crew autonomy and decision-support tools for long communication delays. Grace Douglas, the CHAPEA principal investigator, said in the NASA release that the agency is “extremely proud of the crew for their commitment and achievements.” Michael Stenger, chief scientist for NASA’s Human Research Program, said the knowledge from these experiences can be translated to Moon Base “and beyond.”

The study sits inside a larger plan. The program describes a three-step path of analogs on Earth, the International Space Station and Artemis lunar missions, set out in its own explainer on three steps to Mars, and CHAPEA belongs to the first step, where isolation effects on mental health are studied on the ground. The wider Human Research Program lists human factors and behavioral performance, human health countermeasures, space radiation, and research operations among its elements.

Isolation and confinement is one of the hazards NASA’s Human Research Program tracks, alongside radiation, distance from Earth, microgravity, and hostile or closed environments, according to the program’s explainer. The explainer names analog facilities in Houston as the setting for studying how isolation affects mental health, which is the role CHAPEA plays. The Human Research Program page, last updated on Oct. 14, 2026, lists David K. Baumann as the program’s director and says its research draws on ground facilities, the space station, Artemis missions and analog environments, with the stated goal of supporting trips to the Moon, Mars and beyond.

No results have been published yet from the mission, and NASA has not said when findings will be released. Stenger’s remark ties the Mars rehearsal to the agency’s lunar plans, which is a reminder that the lessons about food, exercise and decision-making under delay are meant to apply to more than one destination. For now the record consists of a start date of Oct. 19, 2025, an exit date of Oct. 31, 2026, four named volunteers and a data set that scientists are only beginning to analyze, with two weeks of debriefs still to come after the crew steps out.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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