The blue ocean
The wavy surface of the ocean is a product of the sea waters being pushed by the blowing winds. The deeper internal waves are similar to the surface ripples, except in that they travel deep underneath the superficial waters. The internal wavy movement of the deep sea is the result of earth’s rotation, and the difference in density of the layers of water. The deeper ocean waters are colder, more salty and dense. In contrast, the superficial waters which we can see, are lighter and flow above the deeper inner ripples, driving waves above the waves.
Deep invisible ripples
The deeper internal waves are marked on the sea surface by bands of smooth and rough water. Someone standing on the seashore typically will not be able to see the deep internal waves, which can be huge with heights of up to 100 meters and widths of hundreds of miles but nearly invisible. https://phys.org/news/2010-04-phenomenon-internal.html
Although these deep hidden ripples are a recent scientific discovery, the Quran describes these deep wavy waters in the ocean which are not visible to the ordinary observer.
(Quran 24:40) “….Or (the unbelievers’ state) is like the darkness in a deep sea. It is covered by waves, above which are waves, above which are clouds. Depth of darkness, one above another, if a man stretches out his hands, he can hardly see it!….”
Depths of darkness
When light travels through the ocean water, it gets progressively faint. Firstly, in the Photic zone, which is the top 200 meters of the ocean, there is enough light to support photosynthesis and plants. Then comes the Aphotic zone at a depth of 200 to 1000 meters, where there is very little sunlight. Even with modern scuba diving equipment, the deepest diving record is 300 meters. If the depth is greater than 1000 meters, sunlight is unable to penetrate, and it is completely dark. The ocean depth can vary greatly. Mariana Trench in the Western Pacific ocean is the deepest point of all the oceans. This is about 11,000 meters or approximately 7 miles. This is certainly a dark world, where.. “….if a man stretches out his hands, he can hardly see it!….” (Quran 24:40).
For further read on the Quran and the scientific discoveries: https://qpeace.net/?p=318