1)Cave Entrance
2) A dead end. Spooky
3) Entrance chamber
4) A side room, possibly a bunk room for the staff... or evil cultists. There's always evil cultists.
5) Apparently I don't believe in the number 5.
6) Central chamber.
7) Elevated room overlooking the cistern below.
8) Steps down to a sealed and locked door that allows entry to the cistern.
9)Large cistern trailing off into the underground distance, three outlet pipes in a far corner.