One of the creators of DOOM is back with something special. Romero released "Tech Gone Bad" out of the blue this morning, which he described as a "warm-up". A warm-up to what, though? Hmm.
— John Romero (@romero) January 15, 2016
Here's how Romero describes the setup for this stage:
After exiting the Computer Station you knew the worst was up ahead. You still hadn't reached the place where the demons were coming from. The steel door shuts behind you as you realise you're there; you're at the Phobos Anomaly. Cracks from hell are all over the place as seepage from the portal invades the entire installation. Now it's time to find the portal and stop the demons from coming through. You know UAC had hundreds of scientists working at a high-tech lab somewhere in this area, and the portal must be connected to it somehow. Time to lock and load.
You can download the level over here.