NASA 'Aquanauts' to Test Space Exploration Tech on Ocean Floor

NASA astronaut Dottie Metcalf-Lindenburger tests different ways to anchor to the surface of an asteroid on a simulated spacewalk on the ocean floor during the NEEMO 16 mission.
NASA astronaut Dottie Metcalf-Lindenburger tests different ways to anchor to the surface of an asteroid on a simulated spacewalk on the ocean floor during the NEEMO 16 mission. (Image credit: ESA / Herve Stevenin)

NASA is heading back to the ocean floor twice in the next three months to test out techniques and technologies that could improve astronauts' lives in orbit and help them explore an asteroid down the road.

Teams of "aquanauts" will live and work at a research facility 62 feet (19 meters) beneath the waves off the coast of Florida in two missions staged by the NASA Extreme Environment Mission Operations program, or NEEMO.

The first of the two stints, known as NEEMO 18, starts on July 21 and lasts for nine days. The seven-day NEEMO 19 mission begins on Sept. 7.

"It is both challenging and exciting for our astronaut crews to participate in these undersea missions in preparation for spaceflight," Bill Todd, NEEMO project manager at NASA's Johnson Space Center in Houston, said in a statement.

"It is critical that we perform science applicable to NASA’s exploration goals in a high-fidelity space operational context," he added. "The extreme environment of life undersea is as close to being in space as possible."

NEEMO 18 will primarily investigate astronaut health issues and behavioral health and performance, while NEEMO 19 is designed to evaluate "telementoring" operations for the European Space Agency (ESA), NASA officials said. (In telementoring, an astronaut is given instructions via voice or video by an offsite expert.)

Both missions will also include extravehicular activities (EVAs), simulated spacewalks that send the aquanauts out into the ocean for a variety of purposes.

"These EVAs will focus on evaluating man-machine work systems and EVA tools and techniques for exploration tasks in varying levels of gravity ranging from that of asteroids to the gravity of Martian moons and Mars itself," NASA officials wrote in a description of the upcoming missions.

Both NEEMO 18 and NEEMO 19 will be based at Florida International University’s Aquarius Reef Base, which lies 6.2 miles (10 kilometers) off the coast of Key Largo, Florida.

Japanese astronaut Akihiko Hoshide will command NEEMO 18, which also includes NASA astronauts Jeanette Epps and Mark Vande Hei and ESA astronaut Thomas Pesquet.

NEEMO 19 will be led by NASA astronaut Randy Bresnik. Other crewmembers are Canadian Space Agency astronaut Jeremy Hansen, ESA astronaut Andreas Mogensen and Herve Stevenin, ESA’s head of extravehicular activity training at the European Astronaut Center in Cologne, Germany.

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Mike Wall
Senior Space Writer

Michael Wall is a Senior Space Writer with and joined the team in 2010. He primarily covers exoplanets, spaceflight and military space, but has been known to dabble in the space art beat. His book about the search for alien life, "Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.