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).

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-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-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).

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-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-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-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-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-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-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.

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, 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.

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.

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.

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-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-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-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 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 )

JSC2001-00006 (January 2001) --- An unidentified member of the STS-104 crew simulates an ejection into a body of water during an emergency bailout training session for the astronauts in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

S99-06194 (21 June 1999) --- Astronaut C. Michael Foale, mission specialist, rehearses Extravehicular Activity (EVA) with the Hubble Space Telescope (HST) mockup in the Neutral Buoyancy Laboratory (NBL).

JSC2000-02532 (21 March 2000) --- Astronaut Scott D. Altman, STS-106 pilot, prepares to deploy his life raft during emergency bailout training at the Neutral Buoyancy Laboratory (NBL).

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 )

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.

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.

JSC2009-E-145694 (17 July 2009) --- Astronaut Robert Behnken, STS-130 mission specialist, gets help in the donning of a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2009-E-072674 (9 April 2009) --- Astronaut Michael Good, STS-125 mission specialist, works with a Hubble Space Telescope mock-up during a spacewalk training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2011-E-054080 (13 June 2011) --- NASA astronaut Doug Hurley (foreground), STS-135 pilot, participates in a training session in the simulation control area in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility near NASA's Johnson Space Center. Photo credit: NASA

JSC2010-E-014273 (27 Jan. 2010) --- NASA astronaut Andrew Feustel, STS-134 mission specialist, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

Teams perform a series of tests at NASA’s Neutral Buoyancy Laboratory (NBL) at the agency’s Johnson Space Center in Houston on Oct. 7, 2015, to evaluate the most efficient way for astronauts to get out of the Orion spacecraft after weeks or months away from Earth. Part of Batch image transfer from Flickr.

JSC2007-E-06537 (2 Feb. 2007) --- Astronaut Scott E. Parazynski, STS-120 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2006-E-44646 (16 Oct. 2006) --- Astronaut James F. Reilly II, STS-117 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) spacesuit, is about to begin a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center.

JSC2010-E-025744 (23 Feb. 2010) --- Attired in a training version of his shuttle launch and entry suit, European Space Agency astronaut Roberto Vittori, STS-134 mission specialist, is pictured during a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2000-02541 (21 March 2000) --- Astronaut Richard A. Mastracchio, STS-106 mission specialist, prepares to participate in an emergency bailout simulation in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Center near the Johnson Space Center (JSC).

JSC2005-E-02827 (26 January 2005) --- Astronaut Stephen K. Robinson, STS-114 mission specialist, dons a training version of the Extravehicular Mobility Unit (EMU) spacesuit prior to being submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. Suit technicians assisted Robinson.

JSC2007-E-113503 (17 Dec. 2007) --- Astronaut K. Megan McArthur, STS-125 mission specialist, participates in a training session at a console in the simulation control area in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility (SCTF) near Johnson Space Center (JSC).

JSC2009-E-208908 (17 Sept. 2009) --- NASA astronaut Stephanie Wilson, STS-131 mission specialist, attired in a training version of her shuttle launch and entry suit, is pictured during a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2002-00515 (19 February 2002) --- Astronaut Piers J. Sellers, STS-112 mission specialist, simulates a parachute drop into water during an emergency bailout training session at the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Sellers is attired in a training version of the shuttle launch and entry suit.

JSC2008-E-006612 (23 Jan. 2008) --- Attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, astronaut Ronald J. Garan, STS-124 mission specialist, awaits the start of a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center.

JSC2007-E-06442 (31 Jan. 2007) --- European Space Agency (ESA) astronaut Paolo Nespoli, STS-120 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2008-E-124037 (20 Oct. 2008) --- Astronaut Tom Marshburn, STS-127 mission specialist, gets help with the donning of a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2008-E-141520 (6 Nov. 2008) --- Astronaut Mike Massimino, STS-125 mission specialist, gets help in the donning a training version of his Extravehicular Mobility Unit (EMU) spacesuit prior to being submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2010-E-025722 (23 Feb. 2010) --- NASA astronaut Greg Chamitoff, STS-134 mission specialist, gets helps with the donning of a training version of his shuttle launch and entry suit in preparation for a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2007-E-113593 (18 Dec. 2007) --- Astronaut Michael J. Massimino, STS-125 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2007-E-113597 (18 Dec. 2007) --- Astronaut Michael T. Good, STS-125 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2003-00666 (13 November 2003) --- Astronaut Stephen K. Robinson, STS-114 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) space suit, waves as he is submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

JSC2002-00532 (19 February 2002) --- Astronaut Jeffrey S. Ashby, STS-112 mission commander, simulates a parachute drop into water during an emergency bailout training session at the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Ashby is attired in a training version of the shuttle launch and entry suit.

JSC2010-E-075082 (7 May 2010) --- NASA astronaut Steve Lindsey, STS-133 commander, attired in a training version of his shuttle launch and entry suit, participates in a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Crew trainer Adam Flagan assisted Lindsey.

JSC2007-E-06455 (31 Jan. 2007) --- European Space Agency (ESA) astronaut Paolo Nespoli, STS-120 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2002-00518 (19 February 2002) --- Astronaut Sandra H. Magnus, STS-112 mission specialist, simulates a parachute drop into water during an emergency bailout training session at the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Magnus is attired in a training version of the shuttle launch and entry suit.

JSC2010-E-013702 (20 Jan. 2010) --- Attired in a training version of his shuttle launch and entry suit, astronaut Ken Ham, STS-132 commander, awaits the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2010-E-046449 (31 March 2010) --- NASA astronaut Tim Kopra, STS-133 mission specialist, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2005-E-31234 (28 July 2005) --- Astronaut William A. Oefelein, STS-116 pilot, attired in a training version of the shuttle launch and entry suit and equipped with a one-person life raft, floats in water during an emergency egress training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center.

View of students participating in the International Underwater Remotely Operated Vehicle (ROV) competition, organized by the Marine Advanced Technology Education Center (MATE), at the Sonny Carter Training Facility (SCTF) Neutral Buoyancy Laboratory (NBL). Photos taken for Johnson Space Center (JSC) Features and Web stories.

Teams perform a series of tests at NASA’s Neutral Buoyancy Laboratory (NBL) at the agency’s Johnson Space Center in Houston on Oct. 7, 2015, to evaluate the most efficient way for astronauts to get out of the Orion spacecraft after weeks or months away from Earth. Part of Batch image transfer from Flickr.

JSC2009-E-208978 (17 Sept. 2009) --- NASA astronaut Dorothy Metcalf-Lindenburger, STS-131 mission specialist, attired in a training version of her shuttle launch and entry suit, is pictured during a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2007-E-06419 (31 Jan. 2007) --- Astronaut George D. Zamka, STS-120 pilot, attired in a training version of his shuttle launch and entry suit, awaits the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2002-00517 (19 February 2002) --- Astronaut David A. Wolf, STS-112 mission specialist, floats in a small life raft during an emergency bailout training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Wolf is attired a training version of the shuttle launch and entry suit.

JSC2010-E-025747 (23 Feb. 2010) --- Attired in a training version of his shuttle launch and entry suit, NASA astronaut Michael Fincke, STS-134 mission specialist, is pictured during a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2007-E-113605 (18 Dec. 2007) --- Astronaut Michael T. Good STS-125 mission specialist, attired in a training version of the Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2006-E-49773 (16 Nov. 2006) --- Astronaut Clayton C. Anderson, Expedition 15 flight engineer, salutes as he dons a training version of the Extravehicular Mobility Unit (EMU) space suit prior to being submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center.

JSC2009-E-208859 (17 Sept. 2009) --- Japan Aerospace Exploration Agency (JAXA) astronaut Naoko Yamazaki, STS-131 mission specialist, attired in a training version of her shuttle launch and entry suit, participates in a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2006-E-44632 (16 Oct. 2006) --- Astronaut John D. (Danny) Olivas, STS-117 mission specialist, dons a training version of the Extravehicular Mobility Unit (EMU) spacesuit prior to being submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center. Suit technicians assisted Olivas.

JSC2001-00022 (January 2001) --- Astronaut Michael L. Gernhardt, STS-104 mission specialist, is assisted by a diver during an emergency bailout training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center (JSC). Gernhardt will join four other astronauts for a June mission with the International Space Station (ISS).

JSC2010-E-013686 (20 Jan. 2010) --- Astronaut Mike Good, STS-132 mission specialist, gets help with the donning of a training version of his shuttle launch and entry suit in preparation for a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2009-E-145705 (17 July 2009) --- Astronaut Nicholas Patrick, STS-130 mission specialist, gets help in the donning of a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2010-E-046445 (31 March 2010) --- NASA astronaut Alvin Drew, STS-133 mission specialist, works with a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2008-E-118365 (25 Sept. 2008) --- Attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, astronaut Mike Massimino, STS-125 mission specialist, awaits the start of a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2011-E-029070 (21 March 2011) --- NASA astronaut Doug Hurley, STS-135 pilot, participates in a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration

JSC2002-01759 (20 September 2002) --- Astronaut Robert L. Curbeam, Jr., STS-116 mission specialist, floats in a small life raft during an emergency bailout training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Curbeam is attired in a training version of the shuttle launch and entry suit.

JSC2005-E-19211 (11 May 2005) --- Astronaut Christopher J. Ferguson, STS-115 pilot, attired in a training version of the shuttle launch and entry suit, awaits the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2002-00818 (17 April 2002) --- Astronaut Stephen K. Robinson, STS-114 mission specialist, assisted by divers, floats in a small life raft during an emergency egress training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

JSC2008-E-118404 (26 Sept. 2008) --- Astronaut Andrew Feustel, STS-125 mission specialist, gets help in the donning of a training version of the Extravehicular Mobility Unit (EMU) spacesuit prior to being submerged in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2010-E-042737 (25 March 2010) --- NASA astronaut Michael Barratt, STS-133 mission specialist, participates in an ISS small tools training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2001-00021 (January 2001) --- Astronaut Janet L. Kavandi, STS-104 mission specialist, is assisted by a diver during an emergency bailout training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center (JSC). Kavandi will join four other astronauts for a June mission with the International Space Station (ISS).

JSC2011-E-040211 (10 March 2011) --- NASA astronaut Rex Walheim, STS-135 mission specialist, prepares to train in the Neutral Buoyancy Laboratory (NBL) near NASA?s Johnson Space Center in Houston March 10, 2011. Photo credit: NASA Photo/Houston Chronicle, Smiley N. Pool

JSC2001-00020 (January 2001) --- Astronaut James F. Reilly, STS-104 mission specialist, attired in a training version of the shuttle launch and entry garment at the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center (JSC). Reilly will join four other astronauts for a June mission with the International Space Station (ISS).

JSC2002-01794 (20 September 2002) --- Astronaut Robert L. Curbeam, Jr., STS-116 mission specialist, floats in water during an emergency egress training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Curbeam is attired in a training version of the shuttle launch and entry suit.

JSC2008-E-118383 (25 Sept. 2008) --- Astronauts John Grunsfeld (left) and Andrew Feustel, both STS-125 mission specialists, participate in a training session at consoles in the simulation control area in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility near NASA's Johnson Space Center.

JSC2009-E-215166 (30 Sept. 2009) --- Attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, astronaut Garrett Reisman, STS-132 mission specialist, awaits the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2008-E-044822 (4 June 2008) --- NASA astronaut Nicole Stott, Expedition 20/21 flight engineer, prepares for a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Stott is wearing a training version of her Extravehicular Mobility Unit (EMU) spacesuit.

JSC2010-E-019598 (8 Feb. 2010) --- NASA astronaut Steve Bowen, STS-132 mission specialist, gets help in the donning of a training version of his Extravehicular Mobility Unit (EMU) spacesuit in preparation for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

S99-11105 (9 September 1999) --- A suit technician (out of frame) assists astronaut Edward T. Lu, mission specialist, with a training version of the shuttle launch and entry garment. Lu was about to join his STS-106 crew mates for an emergency bailout training session in the Neutral Buoyancy Laboratory (NBL).

JSC2005-E-19222 (11 May 2005) --- Astronaut Brent W. Jett Jr., STS-115 commander, attired in a training version of the shuttle launch and entry suit, awaits the start of a water survival training session in the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2006-E-50935 (28 Nov. 2006) --- Astronaut Richard A. (Rick) Mastracchio, STS-118 mission specialist, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, awaits a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near Johnson Space Center.

JSC2002-01927 (21 October 2002) --- Astronaut Daniel C. Burbank, STS-115 mission specialist, attired in a training version of the shuttle launch and entry suit, awaits the start of an emergency training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC).

JSC2010-E-042736 (25 March 2010) --- NASA astronauts Alvin Drew (left) and Michael Barratt, both STS-133 mission specialists, participate in an ISS small tools training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2008-E-118434 (26 Sept. 2008) --- Astronaut Michael Good, STS-125 mission specialist, participates in a training session in the simulation control area in the Neutral Buoyancy Laboratory (NBL) at the Sonny Carter Training Facility near NASA's Johnson Space Center.

Teams perform a series of tests at NASA’s Neutral Buoyancy Laboratory (NBL) at the agency’s Johnson Space Center in Houston on Oct. 7, 2015, to evaluate the most efficient way for astronauts to get out of the Orion spacecraft after weeks or months away from Earth. Part of Batch image transfer from Flickr.

JSC2001-01612 (1 June 2001) --- Astronaut Frederick W. Sturckow, STS-105 pilot, gets help with final touches on the training version of his Extravehicular Mobility Unit (EMU) space suit prior to being submerged in the waters of the Neutral Buoyancy laboratory (NBL) at the Johnson Space Center (JSC).

JSC2002-01972 (28 October 2002) --- Cosmonaut Sergei K. Krikalev, backup Expedition Seven mission commander, floats in a small life raft during an emergency bailout training session in the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center (JSC). Krikalev represents Rosaviakosmos.

JSC2010-E-075021 (7 May 2010) --- NASA astronaut Michael Barratt, STS-133 mission specialist, dons a training version of his shuttle launch and entry suit in preparation for a training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Suit technician George Brittingham assisted Barratt.

JSC2010-E-013685 (20 Jan. 2010) --- Astronaut Piers Sellers, STS-132 mission specialist, gets help with the donning of a training version of his shuttle launch and entry suit in preparation for a water survival training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2008-E-031871 (3 April 2008) --- Astronaut Heidemarie M. Stefanyshyn-Piper, STS-126 mission specialist, makes final touches on a training version of her Extravehicular Mobility Unit (EMU) spacesuit in preparation for a training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2010-E-019611 (8 Feb. 2010) --- NASA astronaut Steve Bowen, STS-132 mission specialist, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center.

JSC2005-E-31233 (28 July 2005) --- Astronaut Mark L. Polansky, STS-116 commander, attired in a training version of the shuttle launch and entry suit, simulates a parachute drop into water during an emergency bailout training session at the Neutral Buoyancy Laboratory (NBL) near the Johnson Space Center.