A shoal of fish over my head. It
      seems like in the sky

Many orange anthiases
      over coral
Lot of fish over corals

Underwater sky

Normally, when the wind is weak and waves are small the water in Red Sea is very transparent. Such conditions occur here 300 days a year. That is why coral fish and even coral worms are very colorful, like butterflies and flowers. The color does matter if your is seen.

So you don't see the water. You see a shoal of fish in the blue sky.