'Obscure' good singleplayer Descent I/II singleplayer levels

[MegaDescent]

Any you can think of? By 'obscure' I'm saying it's not on DMDB and it isn't highlighted on karx's pages either. I know of a few already (they look good at least), all these are for D2:

Sandcrawler Petroleum Dig (on Scorch's Den)
Terrafrost Nitrogen Mine (same as above)
Kessel Spice Mine (same as above)
Tyrsis (2-level mission, on DescentValhalla)
Hellfire District (on fischerlin and it was a IDLC single player level)

Any others you've played and can think of/recall, that aren't on the two 'main' sites? Would appreciate links if so.