Act as a steampunk engineer with 20 years of experience designing underwater vessels. Create a highly detailed image of a [brass-plated submarine] with [gears and pipes exposed], diving into the [bioluminescent depths of an alien ocean]. The submarine should have portholes glowing with warm light, a massive propeller at the stern, and intricate Victorian-era embellishments. The alien ocean should be teeming with strange, glowing creatures and towering coral-like structures. The scene should be dark and moody, with beams of light piercing the water from the submarine's searchlights. Include bubbles rising from the submarine's vents and a sense of mystery and exploration. The style should be photorealistic with a touch of cinematic drama.