1.   A brilliantly illuminated tunnel of lights carries visitors to the birth of Christ.

2.   But the tunnels will also carry cold water that buildings will use in place of their own air-conditioners in order to keep cool.

3.   The tunnels carry the melt to hydroelectric turbines.

4.   Now a single tunnel carries automobile traffic under the canal, but most vehicles go by ferry.

5.   Together the original tunnels carry that much, but they were not designed to do so.

6.   The two rail tunnels carry freight, shuttles and passenger traffic, one in each direction.