Four volunteers have emerged from 378 days inside a simulated Mars habitat at NASA’s Johnson Space Center in Houston. The crew was not on Mars, but the year-long CHAPEA mission recreated aspects of living and working there, giving researchers a chance to study how isolation and mission demands affect people.
CHAPEA stands for Crew Health and Performance Exploration Analog. Its goal is to examine human health and performance, rather than test rockets or landing systems. NASA says the research will help assess food systems and the physical and behavioral effects of a long mission, informing decisions about how to balance risks and resources. The second mission began on October 19, 2025, and lasted 378 days, matching the duration of the first.
The crew lived in a roughly 158-square-meter, 3D-printed habitat built using a material called lavacrete. The structure, constructed with a system from ICON, included four private cabins, workstations, a medical station, shared areas, a kitchen and food-growing spaces. The crew members were commander Ross Elder, flight engineer James Spicer, medical officer Ellen Ellis and science officer Matthew Montgomery.
Their routine included simulated Mars walks across a sandy landscape, where they collected geological samples, carried out exterior maintenance and practiced procedures for using the airlock. They also operated equipment, repaired faults and grew vegetables in a hydroponic system. Exercise and health monitoring were central to the mission, with activities including cycling, blood sampling and a test that measured how efficiently the body used oxygen during exertion.
The volunteers also tested medical monitoring technology, including a device that measures blood pressure and other health indicators, and took part in demonstrations of AI-based medical systems and training. Such tools could be important on a mission where access to a hospital would not be available.
CHAPEA 2 was designed to reproduce challenges including limited resources, prolonged isolation, equipment failures and a 22-minute communications delay. The crew also experienced a simulated, two-week total communications blackout, intended to explore how they would respond without contact with Earth.
Daily life included time beyond mission tasks, from shared evenings and haircuts to playing musical instruments brought along as personal items. NASA’s account also highlights crew photographs arranged around a boot print in the simulated Martian sand. The researchers are interested in morale, group dynamics and how people spend their free time as well as their ability to maintain systems.
NASA says the findings are relevant to plans for both Mars and a future Moon base, where technologies and procedures for living far from Earth could be tested. Researchers, including science lead Grace Douglas, will now analyze data on health, performance, nutrition and crew dynamics. Detailed scientific findings from the second mission have not yet been published.
Sources: Focus.it.