Empty background plate (location only, no characters) for a 3D animated children's science film in a soft Pixar-like 3D render style with gentle volumetric haze and shallow depth. Location: the ocean's twilight zone at 1000 metres depth. Sunlight barely reaches here: the water is a deep, dim blue-teal gloom that grades to near-black at the bottom of the frame; above there is only a faint cool diffuse glow, the water surface is far out of sight. A tall vertical underwater cliff of dark grey-black basalt fills the right third of the frame and recedes into the distance along a canyon; its ledges carry sparse deep-sea life: pale glass sponges, small white sea fans and a few soft corals in muted beige and pale lilac, with plenty of bare rock between them. The left two thirds of the frame are open blue-black water at mid-distance, free space where two swimming children will be placed. Tiny pinpoint blue bioluminescent plankton specks float throughout the water. In the middle distance a loose school of small silver lanternfish, each clearly shaped with eye, fins and forked tail and a row of tiny blue light dots along the belly, about the length of a finger. Fine white marine snow drifts slowly downward. The base of the cliff dissolves into darkness. In the near foreground on the right a rock ledge holds a sea fan about 30 cm tall, giving a readable human scale. Cinematic 16:9, cool desaturated palette of navy, teal and charcoal, the reference picture is used only for the canyon layout.
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