Allah has said in the Quran:
اَوْ كَظُلُمٰتٍ فِىْ بَحْرٍ لُّـجّـِىٍّ يَّغْشٰٮهُ مَوْجٌ مِّنْ فَوْقِهٖ مَوْجٌ مِّنْ فَوْقِهٖ سَحَابٌؕ ظُلُمٰتٌۢ بَعْضُهَا فَوْقَ بَعْضٍؕ اِذَاۤ اَخْرَجَ يَدَهٗ لَمْ يَكَدْ يَرٰٮهَاؕ وَمَنْ لَّمْ يَجْعَلِ اللّٰهُ لَهٗ نُوْرًا فَمَا لَهٗ مِنْ نُّوْرٍ
“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. Darknesses, one above another. If a man stretches out his hand, he cannot see it.” (Quran, 24:40)
This verse mentions the deep water and ocean darkness, which a man can’t see if he stretches his hand out. Darkness is found about 200 meters below in deep seas and oceans. There’s nearly no light at this depth. There is no light under a depth of 1000 metres. Without the aid of submarines or other equipment human beings cannot dive more than 40 meters. In the deep dark region of the sea, such as 200 meters deep, people cannot endure unholy. Specific technology and underwater components have lately been used to find this darkness that allowed them to plunge into the depths of the oceans. The second set of waves is obviously the surface wave that we see, because the verse says there are clouds above the second wave. But the first waves, what about? Scientists recently found that “internal waves arise on interfaces in the density between distinct density levels. Internal waves cannot be viewed by the naked eye, but can be discovered at a given area by examining variations in temperature or salinity.