Having watched a Mentour Pilot video, I am an expert on plane crashes. The problem is that the part that's supposed to be on the top is now on the ground and that part on the bottom is now on top. You have to keep those in the right positions for a safe landing.
Fellow expert speaking: Their problem was that they should have been watching 74 Gear. He ends every single video with, "Until then, keep the blue side up." I'm honestly a little bit excited to see how he addresses it when he starts out the video about the time they forgot to keep the blue side up.