We have seen record flooding in South Texas over the
last few years. When the Canyon, Medina and Olmos dams
overflow, you know you'll see boats on the streets.
But downtown San Antonio, which has a river right
through it, stays high and dry. How?
A tunnel under the city.
At 281 and Josephine a shaft was dug straight down
several hundred feet. Then a huge tunnel-boring
machine was brought in from Japan to chew through
the rock all the way to the south side of downtown.
It got stuck.
Everything worked out eventually, and just in time.
This is where the water comes back up.
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