Generate a massive underground Mine...

Generate a massive underground Minecraft megabase inspired by the underground human city aesthetic of a dark industrial sci-fi civilization. The structure should feel ancient, militarized, survival-focused, and built deep beneath the earth over a long period of time. The build should NOT look futuristic-clean or cyberpunk. It should feel heavy, industrial, brutalist, mechanical, claustrophobic, and partially integrated into natural cave systems. OVERALL STRUCTURE: - Entire build underground beneath a relatively flat meadow/plains biome near sea level - Main structure descends vertically underground - Total structure depth approximately 140–180 blocks - Main design consists of: 1. Surface tunnel network 2. Dome landing chamber 3. Combined silo housing rings 4. Natural cave assembl