Prompt: an old wooden coffin, adrift at sea, sea creatures, barnacles, algae, coral reef, underwater ecosystem, unique environment, shadowy underwater scene, closeup detailed macrophotography, light filtering through the waves, natural textures, moody ambiance, trending on unsplash, lonely derelict, forgotten relic, serene isolation, photography by Henrik Sorensen, Alex Mustard, Joao Carlos Assis, water reflections, smooth sea surface, poetic melancholy, soft pastel hues, detail below the surface.