"Maybe you watched Star Trek IV and thought the idea of having a whale tank made from transparent aluminum to be one of those far fetched sci-fi gimmicks. But would you be surprised to find out that at the time the movie was made, that particular material already existed?"
See link for complete article: Transparent Aluminum
Scotty could no more use that old computer like he did than the kids in the video trying to use a 70's vintage desktop (in the other thread.)
Transparent aluminum was a construction material far stronger and much lighter than its predecessor, plexiglass. A 1-inch thick sheet of transparent aluminum, measuring 60' x 10', was capable of withstanding the pressure of 18,000 cubic feet of water, which could be used in place of a 6-inch thick sheet of plexiglass.
I'm not sure I'd want to be in a tank made of plexiglass either lol ...