NASA Astronaut Frank Rubio dons a spacesuit at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston to train for spacewalks.

NASA Astronaut Frank Rubio gets help putting on a spacesuit at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston to train for spacewalks.

Astronauts Sunita L. Williams, Expedition 14 flight engineer, and Robert L. Curbeam (partially obscured), STS-116 mission specialist, are about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. Williams and Curbeam are attired in training versions of the Extravehicular Mobility Unit (EMU) space suit. SCUBA-equipped divers are in the water to assist the crew members in their rehearsal intended to help prepare them for work on the exterior of the International Space Station (ISS).

NASA astronauts Loral O’Hara (left) and Stan Love (right) pose for a photo during the first dual spacesuit run at NASA’s Neutral Buoyancy Laboratory while wearing Axiom Space’s lunar spacesuits. NASA and Axiom Space teams held the first dual spacesuit run at the Neutral Buoyancy Laboratory in Houston on September 24, 2025 with NASA Astronauts Stan Love and Loral O’Hara wearing Axiom Space’s lunar spacesuit, called the Axiom Extravehicular Mobility Unit (AxEMU). This was the final integration test in the pool, proving both the spacesuit and facility are prepped and ready for Artemis training.

JSC2008-E-045474 (6 June 2008) --- Attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, astronaut Edward M. (Mike) Fincke, Expedition 18 commander, awaits the start of a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2002-E-39744 (26 Sept. 2002) --- Astronaut Steven G. MacLean, STS-115 mission specialist representing the Canadian Space Agency, waves as he is submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center. MacLean is wearing a training version of the Extravehicular Mobility Unit (EMU) space suit.

JSC2002-E-37424 (6 September 2002) --- Astronaut Joseph R. (Joe) Tanner, STS-115 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, is about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

JSC2002-E-37419 (6 September 2002) --- Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, is about to begin a training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

JSC2002-E-39739 (26 September 2002) --- Astronaut Daniel C. Burbank, STS-115 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, is about to be submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

JSC2002-E-39735 (26 September 2002) --- Astronaut Daniel C. Burbank, STS-115 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, is about to begin a training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

JSC2002-E-39737 (26 September 2002) --- Astronaut Daniel C. Burbank, STS-115 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, is about to begin a training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

Commercial Crew Program astronaut training with Boeing PCM crew members Suni Williams & Josh Cassada during ISS EVA Maintenance 1 training at the NBL.

Boeing CFT crew member Mike Fincke with backup Barry "Butch" Wilmore during Boeing CFT/59S BU ISS EVA Maintenance 1 PRF training.

Commercial Crew Program astronaut training with Boeing PCM crew members Suni Williams & Josh Cassada during ISS EVA Maintenance 1 training at the NBL.

Commercial Crew Program astronaut training with Boeing PCM crew members Suni Williams & Josh Cassada during ISS EVA Maintenance 1 training at the NBL.

Boeing CFT crew member Mike Fincke with backup Barry "Butch" Wilmore during Boeing CFT/59S BU ISS EVA Maintenance 1 PRF training.

Commercial Crew Program astronaut training with Boeing PCM crew members Suni Williams & Josh Cassada during ISS EVA Maintenance 1 training at the NBL.

Commercial Crew Program astronaut training with Boeing PCM crew members Suni Williams & Josh Cassada during ISS EVA Maintenance 1 training at the NBL.

Commercial Crew Program astronaut training with Boeing PCM crew members Suni Williams & Josh Cassada during ISS EVA Maintenance 1 training at the NBL.

Boeing CFT crew member Mike Fincke with backup Barry "Butch" Wilmore during Boeing CFT/59S BU ISS EVA Maintenance 1 PRF training.

Commercial Crew Program astronaut training with Boeing PCM crew members Suni Williams & Josh Cassada during ISS EVA Maintenance 1 training at the NBL.

Commercial Crew Program astronaut Barry "Butch" Wilmore in EVA suitup at NBL with Expedition 62 cosmonaut Nikolai Tikhonov during Expedition 62 ISS EVA Maintenance 2 training.

Canadian Space Agency astronaut Jenni Gibbons gets suited up in Axiom Space’s lunar spacesuit at NASA’s Neutral Buoyancy Laboratory in Houston. During a recent test series, NASA engineers and crewmembers wore the lunar spacesuit under water and conducted numerous tasks during simulated lunar operations to test its mobility and functionality and ensure the spacesuit is prepped and ready for Artemis training.

NASA astronaut Loral O’Hara kneels to pick up a rock while testing the mobility of Axiom Space’s lunar spacesuit. NASA and Axiom Space teams held the first dual spacesuit run at the Neutral Buoyancy Laboratory in Houston on September 24, 2025 with NASA Astronauts Stan Love and Loral O’Hara wearing Axiom Space’s lunar spacesuit, called the Axiom Extravehicular Mobility Unit (AxEMU). This was the final integration test in the pool, proving both the spacesuit and facility are prepped and ready for Artemis training.

Canadian Space Agency astronaut Jenni Gibbons practices simulated lunar tasks under water while wearing Axiom Space’s lunar spacesuit at NASA’s Neutral Buoyancy Laboratory in Houston. During a recent test series, NASA engineers and crewmembers wore the lunar spacesuit under water and conducted numerous tasks during simulated lunar operations to test its mobility and functionality and ensure the spacesuit is prepped and ready for Artemis training.

Canadian Space Agency astronaut Jenni Gibbons practices simulated lunar tasks under water while wearing Axiom Space’s lunar spacesuit at NASA’s Neutral Buoyancy Laboratory in Houston. During a recent test series, NASA engineers and crewmembers wore the lunar spacesuit under water and conducted numerous tasks during simulated lunar operations to test its mobility and functionality and ensure the spacesuit is prepped and ready for Artemis training.

Canadian Space Agency astronaut Jenni Gibbons practices simulated lunar tasks under water while wearing Axiom Space’s lunar spacesuit at NASA’s Neutral Buoyancy Laboratory in Houston. During a recent test series, NASA engineers and crewmembers wore the lunar spacesuit under water and conducted numerous tasks during simulated lunar operations to test its mobility and functionality and ensure the spacesuit is prepped and ready for Artemis training.

Canadian Space Agency astronaut Jenni Gibbons gets suited up in Axiom Space’s lunar spacesuit at NASA’s Neutral Buoyancy Laboratory in Houston. During a recent test series, NASA engineers and crewmembers wore the lunar spacesuit under water and conducted numerous tasks during simulated lunar operations to test its mobility and functionality and ensure the spacesuit is prepped and ready for Artemis training.

Canadian Space Agency astronaut Jenni Gibbons practices simulated lunar tasks under water while wearing Axiom Space’s lunar spacesuit at NASA’s Neutral Buoyancy Laboratory in Houston. During a recent test series, NASA engineers and crewmembers wore the lunar spacesuit under water and conducted numerous tasks during simulated lunar operations to test its mobility and functionality and ensure the spacesuit is prepped and ready for Artemis training.

Canadian Space Agency astronaut Jenni Gibbons practices simulated lunar tasks under water while wearing Axiom Space’s lunar spacesuit at NASA’s Neutral Buoyancy Laboratory in Houston. During a recent test series, NASA engineers and crewmembers wore the lunar spacesuit under water and conducted numerous tasks during simulated lunar operations to test its mobility and functionality and ensure the spacesuit is prepped and ready for Artemis training.

NASA and Axiom Space teams held the first dual spacesuit run at the Neutral Buoyancy Laboratory in Houston on September 24, 2025 with NASA Astronauts Stan Love and Loral O’Hara wearing Axiom Space’s lunar spacesuit, called the Axiom Extravehicular Mobility Unit (AxEMU). This was the final integration test in the pool, proving both the spacesuit and facility are prepped and ready for Artemis training.

JSC2002-E-37422 (6 September 2002) --- Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 mission specialist, is photographed as the final touches are made on the training version of her Extravehicular Mobility Unit (EMU) spacesuit prior to being submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Astronaut Brent W. Jett, Jr., mission commander, assisted Stefanyshyn-Piper.

JSC2002-E-37426 (6 September 2002) --- Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 mission specialist, is submerged in the waters of the Neutral Buoyancy Laboratory (NBL) at the Johnson Space Center (JSC). Stefanyshyn-Piper is wearing the training version of the Extravehicular Mobility Unit (EMU) space suit. SCUBA-equipped divers are in the water to assist the astronauts in their rehearsal, intended to help prepare them for work on the exterior of the International Space Station (ISS).

JSC2002-E-39745 (26 September 2002) --- Astronauts Heidemarie M. Stefanyshyn-Piper (left) and Joseph R. (Joe) Tanner, both STS-115 mission specialists, observe training activities of their crewmates from the simulation control area in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility (SCTF) near the Johnson Space Center (JSC).

JSC2002-E-39736 (26 September 2002) --- Astronaut Steven G. MacLean, STS-115 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, is about to begin a training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). MacLean represents the Canadian Space Agency.

JSC2007-E-43438 (15 Aug. 2007) --- Attired in a training version of his shuttle launch and entry suit, astronaut Michael E. Fossum, STS-124 mission specialist, awaits the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2007-E-43420 (15 Aug. 2007) --- Attired in a training version of her shuttle launch and entry suit, astronaut Karen L. Nyberg, STS-124 mission specialist, awaits the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2007-E-43408 (15 Aug. 2007) --- Attired in a training version of his shuttle launch and entry suit, astronaut Kenneth T. Ham, STS-124 pilot, awaits the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2007-E-43407 (15 Aug. 2007) --- Attired in a training version of his shuttle launch and entry suit, astronaut Mark E. Kelly, STS-124 commander, awaits the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

Boeing CFT crew member Mike Fincke with backup Barry "Butch" Wilmore during Boeing CFT/59S BU ISS EVA Maintenance 1 PRF training.

Boeing CFT crew member Mike Fincke with backup Barry "Butch" Wilmore during Boeing CFT/59S BU ISS EVA Maintenance 1 PRF training.

Boeing CFT crew member Mike Fincke with backup Barry "Butch" Wilmore during Boeing CFT/59S BU ISS EVA Maintenance 1 PRF training.

Boeing CFT crew member Mike Fincke with backup Barry "Butch" Wilmore during Boeing CFT/59S BU ISS EVA Maintenance 1 PRF training.

NASA Administrator Jim Bridenstine, center, speaks with Vice President Mike Pence and NASA astronaut Suni Williams during a tour of the Neutral Buoyancy Laboratory at NASA's Johnson Space Center, Thursday, Aug. 23, 2018 in Houston, Texas. Photo Credit: (NASA/Joel Kowsky)

Astronaut and mission specialist Kalpana Chawla, receives assistance in donning a training version of the Extravehicular Mobility Unit (EMU) space suit, prior to an underwater training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. This particular training was in preparation for the STS-87 mission. The Space Shuttle Columbia (STS-87) was the fourth flight of the United States Microgravity Payload (USMP-4) and Spartan-201 satellite, both managed by scientists and engineers from the Marshall Space Flight Center.

Attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, STS-115 astronaut and mission specialist, Heidemarie M. Stefanyshyn-Piper, is about to begin a training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center in preparation for the STS-115 mission. Launched on September 9, 2006, the STS-115 mission continued assembly of the International Space Station (ISS) with the installation of the truss segments P3 and P4.

Attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, astronaut and mission specialist Kalpana Chawla, prepares to go underwater in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. This particular training was in preparation for the STS-87 mission. The Space Shuttle Columbia (STS-87) was the fourth flight of the United States Microgravity Payload (USMP-4) and Spartan-201 satellite, both managed by scientists and engineers from the Marshall Space Flight Center.

Attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, STS-115 astronaut and mission specialist, Heidemarie M. Stefanyshyn-Piper, is about to begin a training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center in preparation for the STS-115 mission. Launched on September 9, 2006, the STS-115 mission continued assembly of the International Space Station (ISS) with the installation of the truss segments P3 and P4.

Wearing a training version of the shuttle launch and entry suit, STS-115 astronaut and mission specialist, Heidemarie M. Stefanyshyn-Piper, puts the final touches on her suit donning process prior to the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. Launched on September 9, 2006, the STS-115 mission continued assembly of the International Space Station (ISS) with the installation of the truss segments P3 and P4.

jsc2024e028394 (April 25, 2024) --- JAXA astronaut Kimiya Yui conducts training for a spacewalk at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/James Blair

jsc2023e080760 (Dec. 15, 2023) --- NASA astronaut Mike Fincke conducts training for a spacewalk at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/Bill Stafford

JSC2007-E-27765 (6 June 2007) --- Astronauts John M. Grunsfeld (right, partially obscured), Michael J. Massimino (third right, partially obscured) and Andrew J. Feustel (left foreground), STS-125 mission specialists, participate in a training session with a Hubble Space Telescope mockup in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

NASA astronaut Suni Williams speaks with Vice President Mike Pence and NASA Administrator Jim Bridenstine during a tour of the Neutral Buoyancy Laboratory at NASA's Johnson Space Center, Thursday, Aug. 23, 2018 in Houston, Texas. Photo Credit: (NASA/Joel Kowsky)

Vice President Mike Pence is seen with NASA astronaut candidates Loral O'Hara, Woody Hoburg, and Jonny Kim during a tour of the Neutral Buoyancy Laboratory at NASA's Johnson Space Center, Thursday, Aug. 23, 2018 in Houston, Texas. Photo Credit: (NASA/Joel Kowsky)

Vice President Mike Pence and NASA astronaut Suni Williams watch on monitors as NASA commercial crew astronauts Victor Glover and Nicole Mann conduct training in the pool at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center during a tour of the facility, Thursday, Aug. 23, 2018 in Houston, Texas. Photo Credit: (NASA/Joel Kowsky)

Vice President Mike Pence and NASA astronaut Suni Williams watch on monitors as NASA commercial crew astronauts Victor Glover and Nicole Mann conduct training in the pool at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center during a tour of the facility, Thursday, Aug. 23, 2018 in Houston, Texas. Photo Credit: (NASA/Joel Kowsky)

Vice President Mike Pence, left, speaks with Deputy Director of NASA's Johnson Space Center Vanessa Wyche, second from left, Director of NASA's Johnson Space Center Mark Geyer, second from right, and NASA Administrator Jim Bridenstine, right, during a tour of the Neutral Buoyancy Laboratory at NASA's Johnson Space Center, Thursday, Aug. 23, 2018 in Houston, Texas. Photo Credit: (NASA/Joel Kowsky)

Exploration geologists and Artemis science officers Trevor Graff, left, and Angela Garcia carry out a lunar training development run at NASA’s Neutral Buoyancy Laboratory (NBL) in Houston. The NBL is a 40-foot deep pool at NASA’s Johnson Space Center where astronauts train for spacewalks in a neutrally buoyant environment. During the session, Garcia and Graff conducted tests of Artemis geology tools and deployed a mock lunar payload under low-angle lighting conditions similar to what astronauts will encounter at the Moon’s south pole. A section of the NBL, which contains full-scale mockups of the International Space Station modules, has been transformed into a lunar training area with soil and rocks that mimic the Moon’s landscape. This testing run marked the first time in the Artemis program that two geologists were suited up simultaneously for lunar geology training in the NBL. The team is using insights from these tests to build the training program for astronauts assigned to future landed missions on the Moon. Credit: NASA

Exploration geologists and Artemis science officers Trevor Graff, left, and Angela Garcia carry out a lunar training development run at NASA’s Neutral Buoyancy Laboratory (NBL) in Houston. The NBL is a 40-foot deep pool at NASA’s Johnson Space Center where astronauts train for spacewalks in a neutrally buoyant environment. During the session, Garcia and Graff conducted tests of Artemis geology tools and deployed a mock lunar payload under low-angle lighting conditions similar to what astronauts will encounter at the Moon’s south pole. A section of the NBL, which contains full-scale mockups of the International Space Station modules, has been transformed into a lunar training area with soil and rocks that mimic the Moon’s landscape. This testing run marked the first time in the Artemis program that two geologists were suited up simultaneously for lunar geology training in the NBL. The team is using insights from these tests to build the training program for astronauts assigned to future landed missions on the Moon. Credit: NASA

Exploration geologist and Artemis science officer Angela Garcia carries out a lunar training development run at NASA’s Neutral Buoyancy Laboratory (NBL) in Houston. The NBL is a 40-foot deep pool at NASA’s Johnson Space Center where astronauts train for spacewalks in a neutrally buoyant environment. During the session, Garcia and fellow exploration geologist and Artemis science officer Trevor Graff conducted tests of Artemis geology tools and deployed a mock lunar payload under low-angle lighting conditions similar to what astronauts will encounter at the Moon’s south pole. A section of the NBL, which contains full-scale mockups of the International Space Station modules, has been transformed into a lunar training area with soil and rocks that mimic the Moon’s landscape. This testing run marked the first time in the Artemis program that two geologists were suited up simultaneously for lunar geology training in the NBL. The team is using insights from these tests to build the training program for astronauts assigned to future landed missions on the Moon. Credit: NASA

Exploration geologists and Artemis science officers Trevor Graff, left, and Angela Garcia carry out a lunar training development run at NASA’s Neutral Buoyancy Laboratory (NBL) in Houston. The NBL is a 40-foot deep pool at NASA’s Johnson Space Center where astronauts train for spacewalks in a neutrally buoyant environment. During the session, Garcia and Graff conducted tests of Artemis geology tools and deployed a mock lunar payload under low-angle lighting conditions similar to what astronauts will encounter at the Moon’s south pole. A section of the NBL, which contains full-scale mockups of the International Space Station modules, has been transformed into a lunar training area with soil and rocks that mimic the Moon’s landscape. This testing run marked the first time in the Artemis program that two geologists were suited up simultaneously for lunar geology training in the NBL. The team is using insights from these tests to build the training program for astronauts assigned to future landed missions on the Moon. Credit: NASA

jsc2024e066564 (Oct. 8, 2024) --- NASA astronaut and Soyuz MS-27 crew member Jonny Kim undergoes International Space Station Extravehicular Activity (EVA) maintenance training, or spacewalk training, at Jonson’s Neutral Buoyancy Laboratory.

jsc2024e066574 (Oct. 28, 2024) --- NASA astronaut and Soyuz MS-27 crew member Jonny Kim undergoes International Space Station Extravehicular Activity (EVA) maintenance training, or spacewalk training, at Jonson’s Neutral Buoyancy Laboratory.

NASA Administrator Jim Bridenstine and NASA astronaut Suni Williams look on as Vice President Mike Pence speaks with NASA commercial crew astronauts Victor Glover and Nicole Mann as they conduct training in the pool at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center during a tour of the facility, Thursday, Aug. 23, 2018 in Houston, Texas. Photo Credit: (NASA/Joel Kowsky)

jsc2026e006041 (Feb. 10, 2026) --- NASA astronaut and Expedition 75 flight engineer Anil Menon participates in a spacewalk training session at Johnson Space Center's Neutral Buoyancy Laboratory in Houston, Texas, ahead of his upcoming mission to the International Space Station. Credit: NASA/James Blair

jsc2025e041069 (April 23, 2025) --- NASA astronaut and Expedition 75 flight engineer Anil Menon participates in a spacewalk training session at Johnson Space Center's Neutral Buoyancy Laboratory in Houston, Texas, ahead of his upcoming mission to the International Space Station. Credit: NASA/David DeHoyos

jsc2025e041073 (April 23, 2025) --- NASA astronaut and Expedition 75 flight engineer Anil Menon participates in a spacewalk training session at Johnson Space Center's Neutral Buoyancy Laboratory in Houston, Texas, ahead of his upcoming mission to the International Space Station. Credit: NASA/David DeHoyos

jsc2024e066553 (Oct. 8, 2024) --- NASA astronaut Jonny Kim and Soyuz MS-27 crew member Jonny Kim undergoes International Space Station Extravehicular Activity (EVA) maintenance training, or spacewalk training, at Jonson’s Neutral Buoyancy Laboratory.

jsc2024e066561 (Oct. 8, 2024) --- NASA astronaut Jonny Kim and Soyuz MS-27 crew member Jonny Kim undergoes International Space Station Extravehicular Activity (EVA) maintenance training, or spacewalk training, at Jonson’s Neutral Buoyancy Laboratory.

Axiom Space's AxEMU (Axiom Extravehicular Mobility Unit) spacesuit being tested at NASA Johnson's Neutral Buoyancy Laboratory. Image Credit: Axiom Space

jsc2014e045190 (May 13, 2014) --- NASA astronaut Nicole Mann is pictured being lowered into the Neutral Buoyancy Laboratory during a spacewalk training session.

jsc2018e035788 (04-12-2018) --- Canadian Space Agency astronaut candidate Joshua Kutryk is in a spacesuit prior to underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory. NASA astronaut candidate Zena Cardman is being helped into a spacesuit for underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory.

S99-05726 (26 May 1999) --- Astronaut Janet L. Kavandi, mission specialist, is about to be lowered into a deep pool for an underwater training session. The training took place at the Johnson Space Center's Neutral Buoyancy Laboratory (NBL), part of the Sonny Carter Training Center. Kavandi has weights on the training version of her extravehicular mobility unit (EMU) which help to provide neutral buoyancy in the pool. Astronauts Kavandi and Gerhard P.J. Thiele were participating in a rehearsal of a contingency space walk for the STS-99 mission.

S98-08181 (March 1998) --- Standing on a mobile platform, astronaut Catherine G. Coleman is in the processing of being submerged in the deep pool of JSC's Neutral Buoyancy Laboratory (NBL). Coleman was participating in a simulation of a contingency space walk in preparation for the STS-93 mission next year. The mission specialist will join four other NASA astronauts for the Space Shuttle Columbia flight, scheduled for spring. The training version of the extravehicular mobility unit (EMU) that Coleman is wearing is weighted and otherwise accommodated to afford neutral buoyancy in the deep pool.

jsc2017e118962 (September 21, 2017) --- 2017 NASA astronaut candidate Zena Cardman readies for helicopter water survival training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory in Houston. Photo Credit: (NASA/Josh Valcarcel)

jsc2018e035917 (April 11, 2018) ---2017 NASA astronaut candidate Matthew Dominick wears a spacesuit prior to underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory. Photo Credit: (NASA/Josh Valcarcel)

jsc2021e017168 (April 30, 2021) --- The SpaceX Crew-3 astronauts and support personnel participate in water survival training at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston, Texas.

jsc2018e035916 (April 11, 2018) --- 2017 NASA astronaut candidate Jasmin Moghbeli is helped into a spacesuit prior to underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory. Photo Credit: (NASA/Josh Valcarcel)

jsc2018e035904 (April 11, 2018) --- 2017 NASA astronaut candidate Matthew Dominick wears a spacesuit prior to underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory. Photo Credit: (NASA/Josh Valcarcel)

jsc2018e095908 (Nov. 7, 2018) --- NASA astronaut candidate Kayla Barron participates in spacewalk training at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston, Texas.

jsc2018e010861 (March 5, 2018) --- Expedition 56-57 crew member Serena Auñón-Chancellor of NASA is suited up and lowered into the Neutral Buoyancy Laboratory for spacewalk training in Houston, Texas.

jsc2018e035771 (04-12-2018) --- NASA astronaut candidate Zena Cardman is being helped into a spacesuit prior to underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory. Photo Credit: (NASA/David DeHoyos)

jsc2018e010851 (March 5, 2018) --- Expedition 56-57 crew member Serena Auñón-Chancellor of NASA is suited up for spacewalk training at the Neutral Buoyancy Laboratory in Houston, Texas.

jsc2021e019138 (May 12, 2021) --- SpaceX Crew-3 astronauts Thomas Marshburn and Kayla Barron prepare for spacewalk training at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston, Texas.

NASA astronaut Rex Walheim is lowered into the water to train for spacewalk in the Neutral Buoyancy Laboratory (NBL) on Tuesday, March 22, 2011, in Houston. ( NASA Photo / Houston Chronicle, Smiley N. Pool )

jsc2023e005877 (Jan. 31, 2023) --- NASA astronaut and SpaceX Crew-8 Pilot Mike Barratt prepares for a spacewalk training session at the Neutral Buoyancy Laboratory near NASA's Johnson Space Center in Houston, Texas.

jsc2018e035922 (April 11, 2018) --- 2017 NASA astronaut candidate Jasmin Moghbeli wears a spacesuit prior to underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory. Photo Credit: (NASA/Josh Valcarcel)

jsc2017e119012 (September 21, 2017) --- 2017 NASA astronaut candidate Warren Hoburg readies for helicopter water survival training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory in Houston. Photo Credit: (NASA/Josh Valcarcel)

Axiom Space's AxEMU (Axiom Extravehicular Mobility Unit) spacesuit underwater during testing of its pressure garment system at NASA Johnson's Neutral Buoyancy Laboratory. Image Credit: Axiom Space

jsc2018e095931 (November 7, 2018) --- 2017 NASA astronaut candidate Jonny Kim prepares for underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory in Houston. Photo Credit: (NASA/Robert Markowitz)

jsc2017e118973 (September 21, 2017) --- 2017 NASA astronaut candidate Jessica Watkins readies for helicopter water survival training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory in Houston. Photo Credit: (NASA/Josh Valcarcel)

jsc2018e095935 (November 7, 2018) --- 2017 NASA astronaut candidate Kayla Barron prepares for underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory in Houston. Photo Credit: (NASA/Robert Markowitz)

NASA astronaut Sandy Magnus waves as she is lowered into the water to train for spacewalk in the Neutral Buoyancy Laboratory (NBL) on Tuesday, March 22, 2011, in Houston. ( NASA Photo / Houston Chronicle, Smiley N. Pool )

jsc2023e026248 (2/7/2023) --- NASA astronaut Victor Glover tests hardware for the ISS External Microorganisms investigation at the Neutral Buoyancy Laboratory at NASA’s Johnson Space Center in Houston.

jsc2018e064842 (07/18/2018) --- 2017 NASA astronaut candidate Bob Hines in a spacesuit prior to underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory in Houston. Photo Credit: (NASA/Norah Moran)

jsc2017e119000 (September 21, 2017) --- 2017 NASA astronaut candidate Warren Hoburg readies for helicopter water survival training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory in Houston. Photo Credit: (NASA/Josh Valcarcel)

jsc2018e035783 (04-12-2018) --- NASA astronaut candidate Zena Cardman is being helped into a spacesuit for underwater spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory. Photo Credit: (NASA/David DeHoyos)

jsc2018e095941 (November 7, 2018) --- 2017 NASA astronaut candidate Jonny Kim is lowered into the training pool for spacewalk training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory in Houston. Photo Credit: (NASA/Robert Markowitz)

jsc2018e035760 (04-12-2018) --- 2017 NASA astronaut candidate Zena Cardman is being helped into a spacesuit prior to underwater training at NASA Johnson Space Center’s Neutral Buoyancy Laboratory. Photo Credit: (NASA/David DeHoyos)

jsc2018e095901 (Nov. 7, 2018) --- NASA astronaut candidate Kayla Barron participates in spacewalk training at the Neutral Buoyancy Laboratory at NASA's Johnson Space Center in Houston, Texas.