indicates the player start position, facing north

1. In the first large cavern beyond the Grenade Launcher, wade into the water and follow the path over to the left. About halfway round, a wooden bridge passes overhead. On its underside is a shootable switch. The rock wall below it will open to reveal a small cave inside ( this secret was originally built by John Romero ).

2. Swimming halfway round the flooded labyrinth, the lowest archway is blocked by a copper grate. To lower it, swim up and press each of the glowing arrows that indicate the vertical exit. They will not respond to shooting.

3. Arriving in the central core of the stalactite chamber, a book stack rises from the floor to the upper walkway. Underneath the wooden walkway, just before you step onto the rising platform, is a shootable switch. This will lift the upper section of the stack which can be accessed from the wooden walkway.

4, 5, 6, 7. From the top position of the rising platform ( the one with the Green Armour on it ) look either side of the archway. Thick wooden posts stick a short distance out of the brickwork at regular intervals around the upper outside of the stalactite chamber. Jumping carefully from one to the next will lead you to the four small alcoves built into the corners of the cavern.

8. Passing through the double doors to collect the Gold Key, look up at the glowing red glass dome. Shoot it and the four book stacks in the nearby rooms will lift up to reveal their contents.

9. Having traveled far into the rocky passages to find the pentagram switch, look into the dark crevasse below the highest of the carven steps. A dim glow illuminates a narrow ledge sticking out a little from the sheer rock face. Step off and fall onto this.

10. Collecting the Silver Key causes its platform to descend back into the chamber from which it rose. Above the exit teleporter a shootable switch can just be seen. This will cause the platform to rise again and expose a square hole down to the cave below. Chuck a couple of grenades in before you investigate...

11. While riding the large platform elevator on your way to the surface, about halfway up there is a marine-sized cavity gouged from the rock face opposite the doors. Step into this and let the platform rise past. You will then plummet into the pool at the bottom of the shaft. A teleporter returns you to the top of the platform.

12. Heading out to the Plaza Of Stars there is a brief respite in a small antechamber. Pick up the Megahealth and turn 180°. On the ceiling above the open doors is a shootable switch. This will cause the upper section of the book stack in front to lift up.

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