I seem to be stuck in Perils of Akumos, so I went and checked the hints page, but- have I done something wrong? It says they're listed in the order you need them, but I got out of the alley before I solved the King's Dilemma, and I don't have the faintest idea what the 'sandstone cavern' is, unless I've already seen it and forgotten about it. I'm back on the station now, and I can't seem to do anything new. I haven't checked out any other messages because I don't want to spoil myself for anything I haven't gotten to yet.

Here's my inventory:
2 Nanoxite Stones
Passcard (CQ60537)
Dragon Key
Noise Filter Headset
Washcloth

Leather Briefcase
Supply Room Card
Crowbar
Knife
Round Pot

Metal Briefcase
Mine Access Card
Light Tube
ISO Energy Pulse Gun
Small Mirror

Employment Papers
OSA Card
Radio Receiver
Tranquilizer Gun
Sleeping Pills

ISO Accident Report
Izacladia Access Card
Fire Extinguisher
Military Uniform
Rock

Scrap of Paper
Business Card
Crank
ISO Officer's Cap
Tranquilizer Spray

I.D. Card
Gold Key
Pickaxe
Pet Snacks

Passcard (CQ30021)
Vault Key
Wrench
Matches

Any help, anyone? It would be very much appreciated.