pressurization. there can be a slow leak. there can be other leaks. typically, it could be leaks around doors and cargo and things like that. typically it's a valve. what happens is these valves fail. when they fail it can be a rapid decompression, or it can be a slow leak. in this case it had to be a rapid decompression for the pilots to respond as they did. everyone was very fortunate the pilots were able to get on their oxygen masks, were able to descend, and hopefully the passengers got their masks on as well. >> as we're going to talk to jean in a second again, going from 38,000 feet to 10,000 feet in three minutes. what does that feel like for these 75 passengers? >> it's like a roller coaster dive because that exceeds the recommended descent level for the plane. that's not to say the pilots did anything wrong. in fact that's exactly what they needed to do. if they're at 38,000 feet and had a rapid decompression, other than being higher that's the worst possible situation because you've got to get that plane