Photos: Inside Johnson Space Center's Neutral Buoyancy Lab

It's a big pool

The pool is about 100 x 200 x 40 ft and hold about 7 million gallons of water.

SEE: NASA shows the world its 20-year virtual reality experiment to train astronauts: The inside story

Image: Erin Carson/TechRepublic

By Erin Carson

Erin Carson is a Staff Reporter for CNET and a former Multimedia Editor for TechRepublic.