Map05: Hidden Base (Prodoomer)

Secrets
1. Past the set of stairs with the chaingunner at the top, you'll find a control room with a pinky guarding a switch. On the north side of this structure, you'll notice a small floor segment jutting out. Open the wall for the secret.

2. Later in the level is a long open road running south through a canyon. At the south end, past where you got the dynamite, is a very deep instant death pit. Drop into the southernmost part of the pit and keep running south so that you hit the ledge. The teleporter will take you to an area with ammo that was visible earlier in the level.

3. After you blow up the wall, there is a waterway you have to swim through. As soon as you round the corner to the south, swim to the bottom and check the east wall for a secret passage.

Rings
09 In the large room near the end with the nukage floor, there is a broken walkway you can jump to. The ducts will take you to another island, where you can see a nook above the nukage falls to your right. You can either rocket jump or climb on sandbags to reach the nook, which will teleport you to a ring.

10 In the first area with the tram cars, the southeastern garage door will open when you press the switch in the western garage. Check the north door frame for a hidden door. Rocket jump up to the teleporter and it will take you to the northwestern garage, which contains the ring.

11 In the computer room where you first encounter cacodemons in this level, there is an area to the east past a very thin ledge, with an inescapable damage floor. Drop some sandbags onto the damage floor so that you can stand on them, then rocket jump into the niche containing the ring. To get out, jump onto your sandbags again and then jump out of the pit.

12 After you open the blue door, climb the stairs and you'll see the screen shake and hear a distant rumbling. Do not step on the teleporter. Instead, return to where you got the blue key and check the northwest cell. An opening high up on the north wall will be open now. Rocket jump up there and open the door to get the ring.