Split-Level Over-Under Photography of Mangrove-Bordered Saltwater Lagoon

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A split-level over-under underwater photograph taken in a calm coastal mangrove lagoon. The lower half of the frame reveals underwater stillness: twisted, silt-free stilt roots of red mangroves plunging into powdery white sand, surrounded by shoals of miniature silver baitfish suspended motionless in clear emerald seawater. The upper half showcases the tranquil lagoon surface reflecting the lush, tangled green mangrove canopy, with a narrow rocky reef barrier visible on the distant horizon separating the estuary from the blue sea. Shot with a 50mm dome port on a water housing, sharp f/11 aperture balancing ambient sunlight above and fill-flash below, celebrating pristine coastal biodiversity.