A colossal volcanic megacity built into a massive active caldera crater, towering obsidian spires with integrated geothermal power channels glowing molten orange, suspended magma-resistant glass districts hovering over liquid rock rivers, sleek volcanic-research craft darting between smoking vents and cooling rock arches, tiny volcanologists dwarfed by erupting geysers navigating between heat-shielded observation platforms, deep charcoal and electric magma orange palette with soft ember glow filtering through perpetual ash clouds, epic upward shot from caldera floor with tiny silhouetted scientists on illuminated heat-resistant platforms emphasizes impossible geothermal engineering scale, photorealistic, cinematic depth of field