Vintage yellow steampunk submarine floats below a giant humpback…

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This whimsical digital fantasy illustration shows a retro steampunk deep sea submarine exploring a sunlit open ocean, positioned directly below a massive, gentle humpback whale rising through clear turquoise water. Soft sunbeams filter down from the ocean surface, illuminating scattered schools of small fish, rising air bubbles, and dark coral reef formations along the seabed, while the submarine's glowing headlight casts a beam of light into the dark open water. The warm vintage design of the submarine paired with the detailed, lifelike whale creates a calm, adventurous mood centered on deep sea exploration and marine fantasy themes.