I was able to check out The Underground at the 2016 Yelp party.
The venue is super-cool and seems to be laid-out in a really thoughtful manner. It's a long, rectangle shaped space with 2 large bars on each long wall and a round bar on one of the short wall. The other short wall is a stage for live music. Tucked in one of the corners is what appeared to be a loungey area with couches (construction wasn't quite done when I was there).
I'll update again once I visit during a regular event - but, at first glance this place has the makings of something great!