I've watched all the videos and I still can't understand how that thing can possibly work. They say it creates vacuum and transports things using atmospheric pressure, but both ends of the tube are open! What vacuum are they talking about? Is there a pump at one end sucking air? Am I looking at an elaborate prank?
Look at 0:14. This thing is put a little bit after the start of the pipe, creating a draft. The fish's own body becomes the "plug" that this air pump pushes up.
