I had some involvement with identifying missing persons as a result of the 9/11 attacks, and the Sneha Philip case always bugged me. It is highly doubtful she was near (i.e., walking by) the Trade Center and killed by debris. They very likely would have found remains. It is highly doubtful she entered one of the buildings to "help". It really was not possible for non-emergency personnel to enter any of the buildings after the attacks. It's doubtful she was alive after 9/11, since there very likely would have been some sort of trail (e.g., credit card use). As an Indian national, she could have returned to India without a passport, but the credit card issue remains. The odds of her being killed by some other means (say, late on 9/10) is remote. Very likely a body would have been found eventually. She wasn't exactly Jimmy Hoffa. Since records of who entered the World Trade Center the day of (but before) the attacks were destroyed when the buildings collapsed, she could have accompanied someone to his or her office and been killed without a trace. Also, she could have been killed in the Marriott Hotel, which was destroyed that day. Since there was no room in her name, she would have had to have been staying with someone else. I know of at least one other person who likely met her fate that way (though in her case there was a room in her name). These last two scenarios (visitor and hotel guest) are the most likely scenarios.