DGFC, Dark Giger Flooded Crypt, dgfc_altar, monumental biomechanical ritual altar inside a flooded alien gothic crypt, massive black metallic sacrificial table covered with intricate biomechanical engravings and skeletal relief patterns, central alien throne fused into cathedral wall architecture, towering ribbed gothic arches and dense organic cable structures surrounding the chamber, elongated biomechanical skull statues embedded into pillars and walls, shallow reflective black water covering the floor with circular liquid ripple patterns, cracked wet stone pathway leading toward the altar, glowing cyan-blue spectral flames emerging from organic egg-shaped braziers, cold volumetric blue illumination reflecting across dark metallic surfaces, dense atmospheric haze, ultra-detailed biomechanical textures, oppressive sacred dark sci-fi atmosphere, symmetrical centered composition, deep perspective, ancient alien cathedral environment