Analog astronauts: How living underwater can prepare humans for space missions

I have been dreaming of doing research in space as an astronaut my whole life, but for some reason, the thought of working underwater made menervous. I’ve known for a long time that astronauts train underwater to simulate different scenarios they’re likely to experience in space. Diving was never an issue for me, either — I even made it as far as becoming a certified rescue diver.So what was the problem?This summer, I led a simulated space mission in an underwater habitat called the Jules�