If you've been living under a rock, or just happen to swing by this forum, you may not be aware of the spiritual successor to Descent, OVERLOAD.
It's been in development for a year or so now, and they've just released a new playable teaser. It plays just like Descent, to be honest.
So if you like Descent but don't care for Descent Underground, or you need a a new 6DOF fix in your life, try it out!

Grab it now:
http://playoverload.com/playable-teaser/

Hunter wrote: If you've been living under a rock

I'm stuck there

You can check out some videos on the official Revival Productions youtube channel too

Overload Playable Teaser 2.0
Overload Trailer on Steam Early Access

I haven't played much of it yet, but it definitely captures that Descent spirit. I think this could be the beginning of something great.