Massive 99x99 underground excavatio...

Massive 99x99 underground excavation shaft beneath a medieval industrial Minecraft base, gigantic vertical mining pit descending into deep deepslate layers, layered circular retaining walls made from deepslate and spruce wood supports, huge wooden scaffolding, support beams, hanging bridges, stair systems and mine structures built into the walls, realistic engineered construction, industrial fantasy aesthetic, dark atmospheric lighting with lanterns and lava accents, highly detailed vertical depth, central 11x11 suspended structure connected by chains and support beams, cinematic megabuild, symmetrical quarry design, immersive underground mining civilization atmosphere