Part 4/13:
The claim largely hinges on NASA’s Neutral Buoyancy Laboratory (NBL) in Houston, which is used to train astronauts. The lab is an underwater mockup of the ISS, equipped with divers and various equipment, allowing astronauts to practice extravehicular activities (EVAs) in a simulated weightless environment. Critics interpret this as evidence that the actual spacewalks are faked underwater, claiming visual clues like lighting and bubbles support this.
The truth is straightforward:
The underwater environment is only used for astronaut training, not for filming actual spacewalks.
Real EVAs are conducted in orbit with zero gravity, which cannot be perfectly simulated underwater but can be assessed through visual comparisons.