Question

What zone is the water cool and dark?

Answer 1

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There are 5 layers in the ocean:
- Epipelagic zone (sunlit)
- Mesopelagic zone (twilight)
- Bathypelagic zone (midnight)
- Abyssopelagic zone (lower midnight)
- Hadopelagic zone (the underworld :P)

The zone you are looking for is probably the midnight zone (bathypelagic layer), the water is cool and dark there. Could also be the abyssopelagic layer but that one is cold and it receives no sunlight at all.

I added an image in the attachement.