E1M7: Biosphere (No End In Sight)

E1M7: Biosphere is the seventh map of the 1994 Ways To Die episode of No End In Sight. It was designed by Xaser Acheron.

Essentials
Take the shotgun then open the door on your left and go down two sets of steps to a silver lift that will take you down to a large room with a gray walkway surrounded by nukage. Go to the south side of this walkway and open the small door here, then climb the steps to a room with three shotgun guys and press the switch on the central column; this will lower the bottoms of the three windows in the room so you can step through them to the nukage pit below. Climb up the steps in the south-east corner then follow the path north up two more sets of steps to a building with a silver-green wall. You now need to follow the path east and north to reach the north-eastern corner of the level, which will take you past a number of imps and shotgun guys on overhead ledges along with a number of demons.

After crossing a zig-zag bridge, head west past a concrete tower to kill a large number of approaching zombiemen and imps then go past them until you reach a door requiring the red keycard. Look south to see a metal tower and go round it to climb some steps and reach a nukage pool containing two radiation shielding suits; take one of the suits then flip the switch between them to lower a wall, step past it and immediately turn right to follow a narrow nukage stream lined with health bonuses. At the end, climb the steps to the top and press the switch here to lower a lift then step past it to see the blue keycard on a pillar ahead. Press the switch on the south side of the column to lower the keycard and raise the nukage around it; be ready to kill some imps and shotgun guys that are released when you collect the key.

Head south to collect a chaingun and return to the large nukage room, then backtrack to the starting point and head through the east door to find two more doors that both require the blue key. Open the door at the top of the steps then head east past two imps to another door, pass through it then climb the nearby steps to the top and flip the switch here to raise a bridge over a nukage pit below. Go back to the room with two blue doors and pass through the door at the bottom of the steps this time, which leads to a chamber that has a blue pad between two tech pillars; step over this pad to open two closets containing monsters and raise a set of steps leading up to them. Go into either closet and kill a spectre lying in wait, then enter the alcove that the spectre came from to lower a lift leading up to the bridge you raised earlier. Cross the bridge to collect the yellow keycard.

Head back across the bridge and backtrack to the switch you flipped to raise it. Just before reaching this switch you will pass a small door - go through it and head down the stairs in front of you to reach a door requiring the yellow key. Go through the door to find a rocket launcher then head round to the south-west side of the concrete tower in front of you to find a pillar with poison signs that has a switch on its west side. Flip the switch to lower the tower and reveal a large number of monsters, then approach the pillar inside the tower and flip the switch on it to lower the pillar and reveal a red teleporter. The teleporter will send you to a nukage pool in the north-east corner of the level - press the switch in front of you then go through the door next to it and step on the lift inside the tower ahead, which will carry you up to the red keycard.

Drop through the window and head west to reach the red key door you passed earlier, open it and go down the stairs to a large door with a switch next to it. Flip the switch to open the door and go through to find an armor in front of a large brown tower. Head east around the tower to some steps leading up to a switch and flip it, which will lower the tower and reveal a large number of enemies surrounding a smaller concrete tower. Clear out the monsters then go to the west side of the concrete tower to find a switch which will lower the lift next to it. Ride the lift up and follow the passage round to the exit door, then flip the switch behind this door to finish the level.

Other points of interest
If you fall into the nukage surrounding the blue keycard, you will not be able to get out.

A megaarmor can be found on a blue pillar by the walkway in the south-west corner of the level. Look behind the pillar to find a switch and press it, then climb up the steps in the middle of the walkway to a water pool where a second switch has appeared. Press this switch then quickly return to the first switch to find that the floor has lowered. Step on it before it rises again to get the megaarmor.

Secrets

 * 1) At the south-west end of the map, climb the steps at the north-east end and go north-west through the green wall. There are five rockets at the top of the lift here. (sector 613)
 * 2) At the zig-zag bridge in the north-eastern part of the map, drop to the left and go through a gray wall to find a stimpack, a medikit and a switch. The switch opens up a teleporter on the other side of the wall. (sector 128)
 * 3) On the way to the blue key, you will lower a wall which will allow you to access a nukage channel going north which will eventually wrap around to where the blue key is. Instead of going north along this channel, go south instead. When you approach the dead end the walls will open up back to the starting point. Keep going across the nukage and you will eventually get a computer area map. (sector 224)
 * 4) After getting the blue key, go back to the starting point and open the east door, then take the upper blue door. Go south towards the partial invisibility, and you will hear a lift lower. Go back to the starting point as soon as possible and step onto the gray ledge at the south-west, which is the lift that will take you up. Jump across to the outside to reach a chainsaw. (sector 13)
 * 5) After getting the blue key, go back to the starting point and open the east door, then take the upper blue door. East along the hallway, there is a lever switch on the north wall. Flip it, then go back and take the lower blue door. If you have not already done so, step onto the blue pad to raise the steps, then at the top of the steps, jump south-east through the open terminal. This blinking room holds four rockets. (sector 146)
 * 6) Along the long hallway with the stairs leading down to the yellow key door, go on the flat ground above the stairs all the way to the north. Follow this path until you reach a small set of steps going down to a room containing three switches. If you have pressed the switch in secret #2, there will also be a red circle in the center of the room which functions as a teleporter. The switches grant access to three compartments in the long hallway, but not for long so you will need the teleporter. The south-east switch allows you to access a compartment with a box of shotgun shells, the south-west one allows access to one with a backpack, and the northern switch allows access to the furthest one, the one with the supercharge. This is the only one that counts as a secret, so flip the switch, enter the teleporter, and then enter the secret before it rises. (sector 50)

Current records
The records for the map at the Doom Speed Demo Archive are:

The data was last verified in its entirety on December 21, 2021.

Things
This level contains the following numbers of things per skill level: