window is the fuselage. there was the american airlines flien, flight, 767, on the ground but then you get to the quantis flying from singapore to sydney, engine failure, uncontained, blew out parts of the system and these are very serious incidents. >> what happens if you're at altitude and the window bursts and it makes sense the oxygen masks drop. what happens to the cabin pressure? >> if the parts pierce the cabin, they can cause what's called a rapid decompression and it's a very dangerous situation, not only for the lives of the passengers for sometimes planes are lost depending on how -- what they call explosive decompression it can be. and then of course can you also have pieces of the uncontained engine failure which pierce