One video of a guy testing a Glock 22 in a pool and the other tests a revolver and SR40 in a homemade plexiglass container. He test fires into some trees which I hope contains a backstop.
http://www.theblaze.com/stories/2012/10/01/heres-what-it-looks-like-to-shoot-a-pistol-under-water/
http://www.theblaze.com/stories/2012/10/01/heres-what-it-looks-like-to-shoot-a-pistol-under-water/