At what depth does it get dark (pitch black) in the ocean given the surface is bright during noon time?

Question

At what depth does it get dark (pitch black) in the ocean given the surface is bright during noon time?

Answer 1

Measurements made with today's technology have revealed that between 3 and 30 percent of the sunlight is reflected at the surface of the sea. Then, almost all of the seven colours of the light spectrum are absorbed, one after another, in the first 200 meters, except for blue light. Below a depth of 1,000 meters, there is no light at all.

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