The Abyss addon - DoomDb - The official Doom WAD sharing group!

The player assumes the role of an amateur archaeologist named Miklós, in search for spoils rather than science. His latest excursion is cut short by demons from another dimension, and the treasure made unobtainable. Unable to escape, Miklós must go further into the mountains, discovering what seems to be a lost civilization along the way. Later into the game, the facades change to more alien, tech structures. Miklós discovers a supercomputer that is creating an illusion of the previous temples, controlled by a cult attempting to summon Hell's hordes. He attempts to deactivate their machines, causing immediate effects as the computers shut down. With the illusion deactivated, Miklós eventually finds the cult's leader and destroys him, but at the expense of his own life.

J.M.P van Waveren (MrElusive) went on to work at id Software during Quake III Arena's development, where he developed the AI system used there and in Doom3. He subsequently became Engineering Manager at Oculus VR.

Mrelusive.com