The Crew Health and Performance Exploration Analog (CHAPEA) is a series of missions conducted by NASAsimulating missions on Mars. It consists of three missions, the first of which began on June 25, 2023.[1] The mission is contained in a hangar at the Johnson Space Center in Houston, Texas.[2] Efforts to mimic a real Mars mission include a 22-minute delay in communications,[3] resources limitations,[4] simulated equipment failures, and simulated spacewalks.[5]