From the Nexus description:
Caldera Mine Expanded is a mod that enhances the Caldera Mine area, making it seem as important and high-priority as quests and dialogue made it out to be. The vanilla location is dead, lifeless, and doesn't seem like one of the largest workplaces in all of Vvardenfell. Caldera Mine was impressive in vanilla Morrowind, but it didn't quite live up to the lore around it. This mod aims to fix that.
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The plugin is dirty but will be auto-cleaned by DeltaPlugin (click to expand/collapse):
$ tes3cmd clean DD_Caldera_Expansion.esp CLEANING: 'DD_Caldera_Expansion.esp' ... Loaded cached Master:
/morrowind.esm Loaded cached Master: /tribunal.esm Loaded cached Master: /bloodmoon.esm Cleaned redundant AMBI,WHGT from CELL: ald-ruhn, llethri private quarters Cleaned redundant AMBI,WHGT from CELL: ashanammu Cleaned redundant WHGT from CELL: caldera mine Cleaned redundant AMBI,WHGT from CELL: caldera, mining bunkhouse Cleaned redundant AMBI,WHGT from CELL: caldera, mining company office Cleaned redundant AMBI,WHGT from CELL: caldera, mining guard tower Cleaned redundant AMBI,WHGT from CELL: uveran ancestral tomb Output saved in: 'Clean_DD_Caldera_Expansion.esp' Original unaltered: 'DD_Caldera_Expansion.esp' Cleaning Stats for 'DD_Caldera_Expansion.esp': redundant CELL.AMBI: 6 redundant CELL.WHGT: 7