Beware of Low-Flying Nightmares
The Catacombs, Elevation: -7.5m

General comments:

As the level name suggests watch out for the Nightmares. Actually there are quite a few Oozes down here too (see map). With the MP-41 Machine Gun and Cedar Box you shouldn't have much trouble though.

Keep an eye out for a Diamond Necklace. It's the most valuable (in $ terms) item you'll find in the game and also worth one point. You can even try it on... but remember to take it off. ;-)

Near the end of the level you'll find the Gold Door that Walter mentioned:

Somewhere a few ladders down there's a
huge gold door Muller gave us the key for.
There are eleven more ingots down there,
don't take mine! Get your own!

But without the Gold Key you can't open it.

I had the key, but someone took it. A group
of people passed by, speaking Spanish, and
their leader took it.

What could be inside? The remaining eleven gold ingots? I guess you'll have to find the leader of the Spanish group first.

Items to find:

Diamond Necklace (one point + $120.1K).
One MP-41 Magazine.

Points to note:

Only one MP-41 Magazine to be found on this level. However since you have the Cedar Box it doesn't really matter.

When you pick up the Diamond Necklace your total points will increase to 23. One more point and you'll gain another two health points.

It might appear odd that you haven't come across the eighteenth member of the German team. Perhaps you should go back and ask Walter what happened to him. ;-)

Monsters to kill:

Nightmares, Oozes and Ghouls

Decision to make:

You see a crystal ladder going down. Descending to The Labyrinth.