"Rich S." wrote:

So under water testing is a common thing (except for KC-135's BG)

It may be occasionally used for B-707's.

They use a smaller version on engineers :-)

http://www.nomi.med.navy.mil/Text/St...%20Dunker2.jpg

http://www.nomi.med.navy.mil/Text/St...%20Trainer.jpg

It's kind of fun as long as you don't inhale.

Dave 'steel-toed boot in the teeth' Hyde