Four Volunteers Complete Nasa’s Yearlong Mars Simulation

WHO:

Fast Company - The four CHAPEA crew members were medical officer Ellen Ellis, mission commander Ross Elder, science officer Matthew Montgomery, and flight engineer James Spicer.

NASA - The crew members shown after the simulated journey were Matthew Montgomery, James Spicer, Ross Elder, and Ellen Ellis.

Fast Company - CHAPEA principal investigator Grace Douglas praised the crew’s commitment and achievements.

Fast Company - NASA Human Research Program Chief Scientist Michael Stenger said the mission was valuable for understanding requirements for yearlong missions.

WHAT:

Fast Company - Four volunteers completed a simulated Mars mission lasting 378 days inside a 1,700-square-foot habitat.

NASA - The four-member crew emerged from the simulated Mars journey and posed outside the habitat for the first time in more than a year.

Fast Company - The crew faced simulated resource limitations, isolation, equipment failure, and significant workloads.

Fast Company - After leaving the habitat, crew members were scheduled for two weeks of debriefing and evaluations.

Fast Company - Ellis described the experience: “To my crewmates, it’s been a hell of a year – analog astronauts living in captivity of our own free will.”

WHERE:

Fast Company - The mission took place at NASA’s Johnson Space Center in Houston, inside a habitat designed to resemble a Martian living and working environment.

NASA - The crew posed outside after completing the simulated journey.

WHEN:

NASA - The simulated journey ended on Oct. 31, 2026.

Fast Company - The mission began on October 19, 2025, and the crew emerged over the weekend.

Fast Company - The mission was the second CHAPEA isolation mission; the previous mission ended in 2024.

WHY:

Fast Company - NASA conducted the simulation to study whether people could handle life on Mars and to test mission conditions without the extreme risks of an actual Mars expedition.

Fast Company - The mission aimed to help establish requirements for yearlong missions, including medical and psychological care under communication delays.

HOW:

Fast Company - CHAPEA stands for Crew Health and Performance Exploration Analog. The habitat was produced using a large 3D printer and included living areas, work spaces, and simulated spacewalk capability.

Fast Company - Crew communications with family were limited to email with built-in delays intended to simulate Earth–Mars communication times.

Fast Company - NASA studied the crew throughout the mission using physiological, psychological, and performance measures in a controlled environment.

(UPDATED November 2, 2026 21:02 UTC)

Four volunteers completed a 378-day simulated Mars mission inside NASA’s Houston habitat. They faced isolation, resource limits, and equipment failures. NASA studied the crew to help establish requirements for future yearlong missions.