The Effects Of Sea Pressure
Via Ninme, an old video purported to be taken at several thousand feet depth showing the effect of extreme differential pressure on the local fauna. Since pressure increases at 44psi/100 feet of depth in sea water, the video alleges to show the effect of a 2500+ psi pressure difference difference. (The engineer in me recognizes that the pipe probably wasn't completely depressurized, but the guy in me says, "Kewl!")
Update 0649 02 Nov: The engineer in me noticed that the caption accompanying the video says "...(t)he pressure inside the pipeline is 0 psig"; of course, if you were really measuring it in pounds per square inch gauge you'd need a reference; in the system described by the video, the obvious other pressure source is the ocean, and there's clearly greater than zero differential pressure between the pipe and the ocean. Therefore, the description of the pressure inside the pipe is misleading in the strictest sense of the word. Of course, they probably meant that the inside of the pipe was at normal atmospheric pressure...
Update 0655 02 Nov: Reading the update I just published above, I realized that I'm an insufferable engineering geek. Of course.