Grab your swimsuit and goggles, and join us in the warm, pristine waters of a very exclusive dive site – NASA’s Neutral Buoyancy Lab! This 6.2-million-gallon pool is a simulated microgravity environment where astronauts train for spacewalks, and it’s what NASA diver Arielle Valdez calls her office! Arielle walks – swims? – us through a day in the life of a NASA dive specialist and shares her story of how she went from diving shipwrecks across the world to training astronauts on an underwater, true-to-size mockup of the International Space Station.