Ok, did not watch the video completely but it seems mostly about the low pressure requirements. It seems that the author does not realize that hyperloop is not a vacuum tube but a low-pressure environment. Actually the pod depends on surrounding air to create the air cushion it drives on.<p>Also, the way to mitigate earthquakes and thermal expansion are (albeit vaguely) mentioned in the alpha document: the tube rests on pylons and the overall structure deforms slightly.<p><a href="http://www.spacex.com/sites/spacex/files/hyperloop_alpha-20130812.pdf" rel="nofollow">http://www.spacex.com/sites/spacex/files/hyperloop_alpha-201...</a>