Astronauts Emerge from Cave After Underground Spaceflight Training

Three ‘cavenauts’ during ESA’s 2013 underground astronaut training course CAVES.
Three ‘cavenauts’ during ESA’s 2013 underground astronaut training course CAVES. (Image credit: ESA-V. Crobu)

Six astronauts have emerged from an Italian cave after nearly a week underground to get a taste of the isolation and danger that will confront them on a space mission.

The expedition was part of the European Space Agency's two-week CAVES exploration course, which trains spaceflyers to work together in multicultural teams under difficult conditions.

CAVES — short for Cooperative Adventure for Valuing and Exercising human behavior and performance Skills — is designed to be as similar to spaceflight as possible. [The 9 Coolest Mock Space Missions]

The CAVES 2013 basecamp underground in Sardinia. (Image credit: ESA-V. Crobu)

As with any mission, the 2013 CAVES astronauts spent some time in training to make sure they were familiar with the procedures they need. Then they descended into the darkness of Sa Grutta cave, on the Italian island of Sardinia, with a list of science tasks to accomplish.

"The daily routine on the [International Space] Station follows a timeline of activities largely oriented toward science experiments. In the cave, the team also followed a daily plan, working long days to push the survey forward and document knowledge of the topography of the cave," the CAVES team wrote in a Sept. 27 blog post.

The 2013 European Space Agency CAVES team works its way through the subsurface in a Sardinian cave. (Image credit: ESA-V. Crobu)

"As we extended our survey, samples were taken for later analysis of water chemistry, microbiology of soil and surfaces, and atmosphere for CO2 [carbon dioxide], temperature and humidity," team members added.

If anything, the astronauts can occasionally find themselves in more danger below the ground than they would above it. Indeed, ESA says it would likely take more time to extract astronauts from Sa Grutta in the event of an emergency than it would to get crewmembers home from the International Space Station.

To keep astronauts as healthy as possible, CAVES organizers stick to a schedule, choose food that isn't apt to spoil and plot the safest routes possible through the subsurface.

This year's crew also got several upgrades from previous expeditions to improve safety. These included new helmet lights, specially adapted shoes and a portable carbon dioxide monitor.

Science findings are still being analyzed, but NASA astronaut Mike Barratt did find some interesting carbon dioxide variations through the cave. Crewmembers also took several videos underground examining "the strong analogies between speleology and spaceflight," ESA officials added.

Astronauts on the crew included NASA's Barratt and Jack Fischer, the European Space Agency's Paolo Nespoli and the Canadian Space Agency's Jeremy Hansen. Russian cosmonaut Aleksei Ovchinin and Japanese spaceflyer Satoshi Furukawa rounded out the team.

Follow Elizabeth Howell @howellspace, or @Spacedotcom. We're also on Facebookand Google+. Original article on

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at:

Elizabeth Howell
Staff Writer, Spaceflight

Elizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. She was contributing writer for for 10 years before joining full-time. Elizabeth's reporting includes multiple exclusives with the White House and Office of the Vice-President of the United States, an exclusive conversation with aspiring space tourist (and NSYNC bassist) Lance Bass, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, flying parabolic, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and a Bachelor of History from Canada's Athabasca University. Elizabeth is also a post-secondary instructor in communications and science at several institutions since 2015; her experience includes developing and teaching an astronomy course at Canada's Algonquin College (with Indigenous content as well) to more than 1,000 students since 2020. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: