"Produce a photorealistic image of a fictional submarine vehicle navigating through a real underwater tunnel in a massive aquarium. The underwater tunnel should be meticulously detailed, featuring thick glass walls, realistic underwater lighting, and diverse marine life. The submarine vehicle must boast a unique and plausible design, as if constructed from high-pressure water-resistant materials. The orange light should filter through the water from the tunnel's lighting and the submarine's searchlights, creating a warm, ethereal glow. A subtle fog should diffuse through the water, adding a layer of depth and mystery to the underwater scene."