Answer :
Inspectors surveying subway damage under the World Trade Center yesterday came across a solid wall of rubble in a tunnel on the No. 1 and 9 lines. Transit officials said they feared parts of the tunnel had collapsed. If that happened, officials said, it could take years to reopen that stretch and restore service to the top of Manhattan.
The report came on a day when it seemed like the subways, and every other part of the New York region were generally lumbered, leaving an overtaxed transportation network. On the day of the World Trade Center buildings were attacked, while the airport was still closed, hundreds of passengers went to them anyway, saying they had been told by their airlines that they would eventually get flights. For hours, they were stranded in parking lots and on highways, blocked by police and mobs.
Across the rest of the city, streets remained deserted for much of the day, as most bridges and tunnels only slowly began to reopen to traffic. During the day, World Trade Center buildings were attacked, and taxicabs outnumbered most other cars, but taxis were still extremely sparse for a weekday; many people were unable to enter Manhattan due to bridge and tunnel closures.
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