Rescue workers sifting through the tons of rubble earlier discovered a passport belonging to one of the suspected hijackers a few blocks from where the World Trade Center's twin towers once stood.
По-моему ясно, в обломков чего именно он был "обнаружен".
А вот мотивация его "появления":
The Black Box and the Indestructible Passport
All four Black Boxes were supposedly destroyed and rendered unusable in spite of the fact that they are designed specifically for plane crashes which result in insurmountable conditions...yet one of the hijackers passports supposedly survives fire and heat of over 1,000 degrees fahrenheit and is found in perfect shape in the rubble around the WTC towers? What kind of idiots does the FBI take us for?