Why astronauts are training in the world's deepest caves

Exploring new worlds · 4:15 · Video: European Space Agency, ESA · Watch at the source

In short: To prepare for the isolation of space, an international crew of six astronauts is heading underground. This training uses extreme terrestrial environments to simulate the psychological and physical demands of long-duration space missions.

The training focuses on environments that mirror the constraints of spaceflight, including sensory deprivation, a lack of a natural day-night cycle, and minimal hygiene facilities. By living and working in caves for six days, the crew practices essential teamwork and collaborative problem-solving under pressure.

The mission serves as a proxy for the difficulties of deep-space exploration. The similarities between subterranean and extraterrestrial environments allow astronauts to build resilience and technical skills before they leave Earth's surface.

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