This vintage illustration depicts a fantastical underwater scene. A silhouetted diver, seated in a small, torpedo-shaped submarine, is aiming a harpoon-like weapon towards a large, whale-shaped submarine that is floating in the water. Above them, a lighthouse is tilting precariously, and a flying saucer hovers in the sky. The scene is teeming with marine life, including various fish and seaweed. The background features a distant coastline with mountains and a cloudy sky. The style is reminiscent of a 19th-century illustration, with detailed linework and a slightly whimsical feel.