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, it is believed to be one of the hardest levels not only of the episode but also in the entire Doom series. On this difficulty, there are no medikits or stimpacks; any additional health is limited to nine health bonuses, and there is only one piece of green armor. The easier difficulties have four medikits, two of which are available through a secret.

Walkthrough
Collect the Shotgun in front of you, and head out of this room. Take a left, and go right, into another room. Kill the Imps in here. From where you just entered this room, Go all the way right and hit the switch. Now turn around, and exit this room. Kill any Shotgun Guys that just teleported. From where you exited this room, go all the way straight, then left, and another left to an opening to the right. Go through this hall, and jump in the slime pit in front of you.

When you get to the slime pit, turn right, and take another left, going up a set of stairs. Kill the Shotgun Guys and Imps in front of you. Go straight, heading up another set of stairs, grabbing a Chaingun. At the top of the stairs, go left and grab the Red skull key. Turn around, and go back down the staircase. When you get to the bottom of the stair case where you just took, activate the lift to your right. When you get to the top *run* straight to land on the platform in front of you. Now get to the Red Door across from us. Open it.

Go straight to the wall in front of you. To the left and right of it are paths to the same area. Take either one to an opening. Enter the opening to get the Blue skull key (kill the Imps here too). Now exit the Red Door, and get back to the opening we took to get the Red skull key. Go through the opening, go right, then all the way left to get to the Blue Door. Open it, and go through the exit teleporter.

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 that the logo is removed in console versions of Doom that feature this map, probably due to copyright concerns.

Note: The area surrounding the "NIИ" letters is tagged as a secret sector, as opposed to the letters themselves, so this secret may be a bit tricky to register.

Bugs
There is a small Hall of Mirrors effect visible at the top of the inside of the red door frame due to a missing upper texture. Though it is barely, if at all noticeable in the darkness. Though one might comment on the lower texture being out of place.

In the room behind the red door, part of the edge of the raised area just to the left of the door (line 313) has a switch trigger type on it tagged to the blood surrounding the raised area. This trigger, when used will attempt to lower the blood to the lowest adjacent floor. However, given that the lowest adjacent floor is the same height as the blood, this mistakenly placed trigger does nothing.

Records
The Compet-N records for the map are: