"Big John" wrote in message
...
Fred

One more.

Scuba tanks have to be pressure tested every few years. This is done
in a tank of water in case they fail.

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

It may be occasionally used for B-707's. Here's some pics of a test getting
underway. . .

http://www.harbornet.com/folks/shankland/test1.jpg

http://www.harbornet.com/folks/shankland/test2.jpg

http://www.harbornet.com/folks/shankland/test3.jpg

Rich S.