The neutral buoyancy tanks were in full use today as some of our astronauts tried on their space legs.  The buoyance of the water is a perfect way to simulate EVA (extra-vehicular activity).  Here in our picture you see astronauts Macon Cook and Mark Dickinson in our largest tank with a mockup of an as yet unnamed space vehicle.  This tank holds 22.7 million gallons of water along with whatever gear needs to be mounted for training sessions.  It looks like these two astronauts are passing with flying colors!