E4M1: Hell Beneath (Doom)

E4M1: Hell Beneath is the first map of Thy Flesh Consumed in Doom. It was designed by American McGee and uses the music track "Sign of Evil." On Ultra-Violence difficulty, this level contains no health kits.

Secrets
This "NIN" logo is a reference to Nine Inch Nails, the American industrial rock band. Also, id software's next game, Quake, would feature sound and music by the band's frontman, Trent Reznor.
 * 1) Drop into the nukage pool ahead of you at the start of the level. Press the use key on the end of the platform to the right to lower it, exposing a hidden tunnel with a rocket launcher at its end. Open the wall to the left of the rocket launcher to reveal a room with a pair of teleporters. Each takes you to a corresponding ledge near the level's beginning.
 * 2) In the room behind the red door, make your way left around the rectangular structure and press the use key on the torch. This lowers the rectangular structure, uncovering a hidden "NIИ" logo. Walking over the logo triggers the secret and unleashes some Barons, and may also trap you inside for a short time.

''Note: The area surrounding the "NIИ" letters is tagged as a secret sector, as opposed to the letters themselves, so this secret is difficult to register. This was the cause of many purist players who didn't use cheat codes or level editors to relentlessly search the level for the second secret area even though they had already visited it.''

Records
The Compet-N records for the map are: