Vertiginous view into an alien volcanic crater abyss

The mouth of an extinct volcano on an alien planet, seen up close from the edge of the crater. The first three hundred meters descend into a perfectly vertical gorge of black, glassy, unstable basalt, with jagged, sharp walls carved out by ancient solidified lava flows. The rock is shiny like obsidian, with incandescent cracks glowing orange and crimson. Fragments of stone break off and fall into the void. Greenish toxic mists rise from the depths. An alien atmosphere with a purple sky and turbulent clouds, distant lightning. Dramatic lighting, strong contrasts, grazing light that enhances the glassy textures of the basalt. A feeling of vertigo and monumental scale. Ultra-detailed, photorealistic, cinematic, 8K, high dynamic range, depth of field, volumetric lighting.