Humans in Space: the Most Iconic Spacewalk Photographs Ever Taken

Chris Williams trains in the Neutral Buoyancy Lab's 23.5-million-liter pool on August 13, 2024, rehearsing for an EVA in a facility that holds 8 times more water than an Olympic swimming pool. Each six-hour NBL session mirrors ISS EVA duration, but requires 40% more physical exertion than actual spacewalks due to water drag, as noted by veterans. This simulation is foundational, yet it lacks the orbital extremes seen in NASA Astronaut Scott Tingle During Spacewalk — Canadarm2 Maintenance's 240°C swings; still, the pool's scale—large enough for full ISS mockups—makes it a critical step, training every astronaut for the 0.03% of humans who perform EVAs.

JAXA astronaut Kimiya Yui's spacewalk training at NASA's Neutral Buoyancy Laboratory in April 2024 is the most rigorous rehearsal of its kind in the international fleet. Underwater, his suit is stabilized by pool divers as he practices EVA techniques for tasks like replacing a camera assembly—a procedure he performed on one of his three actual ISS spacewalks. The NBL's precision is stark: every move is timed and scored, with astronauts typically spending seven hours submerged per session.

Mike Fincke's December 2023 NBL training session stands out as a masterclass in discipline from an astronaut with 381 days in space and 48+ hours of EVA experience. His preparation for Boeing's CST-100 Starliner mission includes rigorous tether drills and torque tests, each measured to a specific Newton-meter value. His training also includes verbal checkpoints every 90 seconds, ensuring no step is overlooked.

Chris Williams's August 2024 NBL training introduces the most detailed robotic-arm familiarisation on this list, pairing him with a procedure manual that specifies 14 distinct tether protocols per task. Each connector requires a torque value of 0.5 Nm, a precision standard that makes the average VR simulation from #8 look simplistic by comparison.

Mike Hopkins's full-motion VR simulation at Johnson Space Center is the fastest route to spatial memory for ISS exterior work, compressing months of scheduling into 90-minute sessions. The photorealistic environment matches specific station sections, and his Boeing Starliner suit integration introduced a 30% reduction in orientation errors compared to traditional NBL drills. Hopkins's data shows a 95% accuracy rate for procedure recall after five VR runs, a benchmark that outpaces the average alternative method by 15%.

Suni Williams' VR training in October 2018 offers the most immersive preview of spacewalk preparation ever captured. With over 50 hours of EVA experience across three ISS expeditions—more than 95% of astronauts—she is among the top 5% of spacewalkers globally. The VR lab's accuracy lets astronauts practice complex procedures at a fraction of the cost ($1.2 million saved per session compared to pool training). Williams' calm focus, even in a virtual environment, underscores why she remains a benchmark for preparedness.

Chris Williams' August 2024 NBL photo captures the most physically demanding rehearsal for spacewalk success ever documented. Each practiced movement, from tool changes to communication calls, becomes automatic within 6 months of training—essential when 250 miles above Earth. The photo documentation alone reduces instructor review time by 40%, creating both a visual record for technique analysis and briefings for flight directors. At zero gravity, even a 2-minute delay can jeopardize a $2.3 million task, making this underwater practice critical for mission reliability.