3D animated children's science adventure. Kira and Yan look exactly like @Kids:

3D animated children's science adventure. Kira and Yan look exactly like @Kids: same faces, hair, Yan's glasses, orange-and-black suits with Kira's purple fins and Yan's dark fins, clear bubble helmets, BARE HANDS with skin visible. The place is exactly @Twilight at 1000 m: the water is very dark teal-navy everywhere, as dark above the kids as around them; light comes only from the kids' helmet...