A journey into New Orleans' underground drainage system 

We're taking you to a place in New Orleans very few people have ever been or seen. We're heading underground, into one of the city's subsurface canals.
They're crucial to preventing the city from flooding, but as we saw this summer after major flood events, parts of the canal system have been clogged with debris -- including a car.
To get more perspective on what we're dealing with when it comes to these canals, we got exclusive access.
FULL STORY: www.wwltv.com/...