One being how could someone get inside that cramped wheel well on a jumbo jet. Ryan Owens went to the airplane graveyard in the mojave desert and shows how how it could be possible. Reporter: You... See More
One being how could someone get inside that cramped wheel well on a jumbo jet. Ryan Owens went to the airplane graveyard in the mojave desert and shows how how it could be possible. Reporter: You first of all get an idea of how massive this plane is. And second, how difficult something like this would be to pull off. Why? Well, just take a look at the wheels. The mechanics here tell us each one of these things weighs several hundred pounds. There are four of them here. The landing gear, all of this together, several thousand pounds, a couple of tons. It's possible to climb up something like this. But then what? How do you survive when this retracts into the belly of the plane? We're told this young man at the airport in San Jose climbed the gear with no protection. Remember, he didn't have on gloves or anything like that. Look at my hands after I've just been climbing on this old 767 for a little while. And then, at the airport in Hawaii, the witnesses say he didn't have any grease or any dirt on him. Seems almost impossible. While it's certainly possible to climb these gears, the question is, once you get up here, where would you put a body? Even a small teenage body? Let me explain something to you. This white door right here, this drops after takeoff so that E huge wheels can retract into the belly of the plane. There is no room inside there for much of anything other than these wheels. Our thanks to Ryan Owens. We're going to bring in ABC news aviation consultant, John nance, right now. And people have watched Ryan Owens right there, up close and personal. And you heard David Kerley saying that 24 hours later, many are still scratching their heads. You had time to sit with this now. What are your thoughts this morning. I'm still astounded. Not only that the story is out there. And I guess he may have done what he said he D. I'm still a little bit skeptical. But the main thing is, I'm astounded that people can get into a hibernated state, robin. That's something that I don't think any of us understood. We're told as commercial airline pilots about rapid depressuration. To have something like this go on for five hours is mind-boggling. It really is. And you're not totally convinced. A lot of people are not totally convinced he stowed away there. Is there somewhere else in the plane where he could have hidden? He could have hidden, I suppose, in a baggage compartment. He could have gotten into the e&e compartment. He would have had to know how to open the door. Even there, you have big modules, if you will, in which the bags are put on. Not a free-sitting type of baggage compartment where you could hide. I'm not sure that's possible. Going forward, what do we need to address here? What are the main issues we need to address here? The main issue is that the security has not been what we should have expected. Not just security at San Jose. But across the country. You have to look over the ability to get over a fence. That can't happen. And we've done a good job of all other aspects of security. But the perimeter fences are obviously a weak link. I think that's the biggest lesson out of this. A huge red flag, to say the least. John nance, thanks so much.
This transcript has been automatically generated and may not be 100% accurate.