The Qur'an on Deep Seas and Internal Waves
Allah said in the Qur'an:
(the unbelievers' state) is like the darkness in a deep sea.
It is covered by waves, above which are waves, above which are
clouds. Darkness, one above another. If a man stretches out
his hand, he cannot see it...}
This verse mentions
the darkness found in deep seas and oceans, where if a man stretches
out his hand, he cannot see it. The darkness in deep seas and
oceans is found around a depth of 200 meters and below. At this
depth, there is almost no light. below a depth of 1,000 meters
there is no light at all (Oceans Elder and Pernetta p.27).
Scientists have recently discovered this darkness by means of special equipment and submarines that have enabled them to dive into the depths of the oceans.
We can also understand from the following sentences in the previous verse, "..in a deep sea. It is covered by waves, above which are waves, above which are clouds,..." that the deep waters of seas and oceans are covered by waves, and above these waves are other waves.
It is clear that the second set of waves are the surface waves that we see, because the verse mentions that above the second waves there are clouds. But what about the first waves? Scientists have recently discovered that there are internal waves which "occur on density interfaces between layers of different densities." (Oceanography, Gross, p. 205).
The internal waves cover the deep waters of seas and oceans because the deep waters have a higher density than the waters above them. Internal waves act like surface waves. They can also break just like surface waves. Internal waves cannot be seen by the human eye, but they can be detected by studying temperature or salinity changes at a given location.