Toward the end of the video you can see the support columns with brown paint at the bottom and a yellow stripe above. There have been times when the water was up to the yellow stripe.

Powers to be that worked on the Linq project didn't see a big problem with the water and decided not to do anything to try and put the water into an underground drain or channel, just leave as is. When the water gets that high anyone who parked in the IP garage is there for the duration.