OPENING FRAME of the clip. One 16:9 film frame, stylized 3D kids' animation. No text. Camera behind and slightly above the two children, who float side by side in pitch-black water at 4000 m, seen from the back: Yan (13, taller) on the LEFT of the frame, Kira (7, small, two brown buns) on the RIGHT, about one metre apart; we see the backs of their clear bubble helmets, their black backpacks with glowing cyan bracket lights, orange suits and purple fins. Children exactly as on the character card, image 2. HELMET LIGHTS: each helmet has EXACTLY TWO lights — one dark-grey round puck lamp on the left and one on the right side of the bubble at ear height, outside the glass; seen from behind they are closed dark discs, and from each puck one white beam goes straight forward into the dark. No light or bright spot on the top of the glass. Ahead of them, two metres away, out of the darkness, the giant Stygiomedusa of image 1 (left panel): only partly revealed by their four beams — a patch of the huge smooth dark wine-red bell above and ahead, and one broad flat curtain-like ribbon arm sliding through Yan's beam close in front of him; the rest of the animal dissolves into black. It has no glow of its own. Fine dust glitters only inside the beams; no bubbles. Mood: a quiet moment just before the surprise.
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