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Today technology rules and a computer now controls the timing of both the traffic and railway schedules but there is always someone on call in case of an emergency. After all, this could very well be the only way to help anyone in trouble. In order to fend off potential claustrophobia, reputed “safe houses” were installed at different intervals. In case of a cave-in or some other emergency situation, anyone unfortunate enough to be caught midway through could wait it out somewhere (somewhat) safer.
Of course, there are other everyday concerns as well. With only one place to enter and exit, all the vehicle exhaust has no place to go. Thus real jet engines have been installed to continuously pump fresh air into the tunnel in the current direction of traffic. This was done so that if there was ever a fire in the tunnel, all the flames would be blown behind the vehicles on their way out as opposed to being blown into oncoming traffic.
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