is biking lower wacker drive in Chicago a good/feasable idea? Not sure if location specific questions are on topic here but, here goes:

I live in Chicago, and I'm curious about biking Lower Wacker Drive. (If you're not from Chicago, it's where the underground scenes were shot in Batman: The Dark Knight). It never seemed like the best idea, but 
1. It is easily the most direct route between my house and work and back
2. I do occasionally see bikers on it when I'm driving down there

Specifically I am interested in the chunk between Harrison and Franklin to Lower Michigan and Illinois (which is a fairly large chunk). 

Lower Wacker is a multilevel street that runs through downtown along the 
Chicago river. Since it's underground, it doesn't intersect with a lot of streets, making it an ideal shortcut through downtown if you know your way around. They don't specifically have a bike lane, but I do see bikers down here from time to time. 

The obvious risks are that there is no bike lane; I tend to prefer routes that offer a bike lane, and since there are typically few to 0 bikers down here, drivers are likely not used to looking out for bikers.

Is it a horrible idea to bike here? Is it reasonable if I am paying close attention and taking care to be aware of my surroundings? I would especially value a response from someone who has experience biking down here.
Answer (tl;dr)  Find another route.  

I checked around using google street view to get the image in the question.  Some observations...


There are no cyclists visible anywhere.  There are also no motorcyclists I noticed.
The lighting is poor and patchy
Many of the vehicles travelling the lower deck do not have lights on.
The road surface is patchy and potholed
There are a lot of unforgiving kerbs and concrete barriers
The signage disagrees with itself (speed limit is 30 mph and 20 mph just along)
Access ramps are just as cycle-unfriendly as the lanes.
Plenty of cover if someone wanted to lurk in the dark and accost a hapless cyclist.
Culture of bogans, chavs, yobbery and dangerous driving later at night.


Street View has a real problem following the level - it pops you between levels on the same road, which leads to the point that there is an upper and a lower deck, that both follow the same course.  Why would you confine yourself to the narrow dark and dingy lower deck?  

The one advantage of the lower road is if its raining, you'll be covered for some of our journey.  However the cars will also be wet, making for slipperier roads and dirtier road spray.  The driver's vision will also be obscured to some degree, lowering your safety just as much if you were in the open.

This idiot has recorded a ride on the lower deck.  He's giving all cyclists a bad name with his riding style, and I see no lights at all.

                
            

Other Routes
This PDF has some useful info  http://chicagocompletestreets.org/wp-content/uploads/2016/01/2016-Chicago-Bike-Map.pdf

Here's a snip showing just the whacker drive area.  Franklin, Wells, Dearborn and State are all north/south roads with some kind of bike space.  Washington, Lake (?) and Harrison are all east/west roads with some bike considerations.  You've got some options.



Supporting Links

http://www.chicagotribune.com/news/ct-lower-wacker-drag-racing-met-20150717-story.html