The deep ocean is one of the most mysterious environments on Earth. Far beneath the surface, sunlight gradually disappears, pressure becomes enormous, and the ocean behaves very differently from the world we see from the shore.
More than fourteen centuries ago, the Quran used a striking image of a deep sea covered by waves, with waves above them and clouds above, followed by “darkness upon darkness.”
For Muslims, this fascinating description is among the many miracles of the Quran that encourage us to observe creation and reflect upon the knowledge and power of Allah.
The verse is primarily a spiritual analogy, but its description of the deep sea has also attracted attention in modern discussions about oceanography.
So what exactly does Quran 24:40 say?
1. What Does Quran 24:40 Say?
Allah says:
“Or like the darkness in a deep sea, covered by waves upon waves, topped by clouds. Darkness upon darkness. If one stretches out their hand, they can hardly see it.”
Quran 24:40
This verse appears in Surah An-Nur.
Its imagery is powerful:
A deep sea.
Waves.
Waves above them.
Clouds.
Layers of darkness.
But understanding the verse requires us to first understand its context.
2. The Verse Is Primarily a Spiritual Analogy
Quran 24:40 is not presented as a scientific lesson about oceanography.
The surrounding passage uses powerful imagery to describe the condition of those who reject faith.
The darkness of the deep sea illustrates profound spiritual darkness and confusion.
This is important because we should not remove the verse from its original Quranic purpose merely to turn it into a scientific statement.
At the same time, the natural imagery used by the Quran remains fascinating to examine.
3. What Happens to Sunlight in the Ocean?
Sunlight entering the ocean does not travel indefinitely.
Water absorbs and scatters light.
As depth increases, less sunlight remains.
Different wavelengths of visible light also penetrate water differently.
This means the underwater environment becomes progressively darker as we descend.
Eventually, sunlight becomes extremely weak or disappears entirely.
4. The Ocean Has Different Light Zones
Oceanographers commonly divide the ocean according to the amount of sunlight available.
Near the surface is the sunlit zone, where enough light exists for photosynthesis.
Below it lies a twilight zone, where sunlight becomes increasingly weak.
Deeper still is the midnight zone, where sunlight does not penetrate.
The deep ocean therefore exists in natural darkness.
This gives modern readers an interesting perspective on the Quranic expression:
“darkness upon darkness.”
5. Why Is the Deep Sea So Dark?
The deeper light travels through water, the more of it is absorbed and scattered.
Eventually, there is insufficient sunlight for human vision.
At great depths, an environment can remain dark regardless of whether it is day or night at the ocean surface.
Some deep-sea organisms even produce their own light through bioluminescence.
6. What Does “Waves Upon Waves” Mean?
Another intriguing part of Quran 24:40 is the description:
“waves upon waves.”
When most people imagine ocean waves, they think only of waves visible at the surface.
But the ocean also contains movements and wave phenomena beneath the surface.
One important example is internal waves.
7. What Are Internal Waves?
Internal waves occur within the ocean rather than only at its surface.
The ocean can contain layers of water with different:
- Temperatures
- Salinities
- Densities
Where layers of different density meet, wave-like movements can develop along their boundaries.
These are known as internal waves.
Some can be very large even though a person looking at the ocean surface may not see them directly.
8. Are Internal Waves What Quran 24:40 Means?
We should be cautious.
Some modern Muslim writers interpret the phrase “waves upon waves” as a reference to internal waves beneath surface waves.
This is an interesting possible comparison.
However, we should not claim with absolute certainty that Quran 24:40 is giving a technical scientific description of internal ocean waves.
The verse’s primary purpose is metaphorical and spiritual.
Modern oceanography can provide an additional perspective, but we should distinguish that comparison from the explicit meaning of the verse.
9. Clouds Can Increase Darkness
The verse also mentions:
“clouds” above the waves.
Clouds can reduce the amount of sunlight reaching the ocean surface.
The water itself then progressively absorbs the remaining light.
The complete image therefore contains several potential sources of darkness:
clouds above,
the ocean surface,
water depth,
and progressive absorption of light.
The result is the dramatic expression:
“darkness upon darkness.”
10. Humans Historically Had Limited Access to the Deep Ocean
For most of human history, exploring deep oceans was extraordinarily difficult.
Humans cannot simply swim thousands of meters below the surface.
Pressure increases dramatically with depth.
Light disappears.
Temperatures can become very low.
Specialized technology is required to explore these environments safely.
Modern deep-sea exploration depends on sophisticated equipment such as:
submersibles, remotely operated vehicles, sonar and specialized cameras.
11. Pressure in the Deep Ocean
Darkness is not the only challenge.
Water pressure increases with depth because of the enormous weight of the water above.
At the deepest parts of the ocean, pressure is hundreds of times greater than atmospheric pressure at sea level.
Yet life exists even in these extreme environments.
Deep-sea organisms have remarkable adaptations allowing them to survive under conditions humans cannot tolerate naturally.
12. The Deep Ocean Is Full of Life
For a long time, people might have imagined that extremely deep waters contained little or no life.
Modern exploration has revealed extraordinary ecosystems.
Scientists have discovered:
- Deep-sea fish
- Giant and unusual invertebrates
- Microorganisms
- Coral communities
- Hydrothermal vent ecosystems
- Bioluminescent organisms
Some creatures live without depending directly on sunlight.
The deep ocean remains one of Earth’s greatest frontiers of exploration.
13. Bioluminescence in the Darkness
One of the most fascinating features of deep-sea life is bioluminescence.
Certain organisms can produce light through chemical reactions.
They may use this ability to:
attract prey, communicate, hide, defend themselves or find mates.
In an environment where sunlight is absent, living organisms producing their own light create an extraordinary spectacle.
14. The Quran Uses Nature to Teach Spiritual Lessons
Why does the Quran use the deep sea in this passage?
Because natural phenomena can communicate powerful ideas.
A person surrounded by layers of darkness beneath a deep ocean would have almost no ability to see or navigate.
The Quran uses this physical image to illustrate a spiritual condition.
The point is not simply:
“Look how deep oceans work.”
The deeper message concerns guidance and darkness.
15. Light and Darkness in Surah An-Nur
The context becomes even more meaningful when we remember that An-Nur means “The Light.”
Earlier in the Surah, Allah says:
“Allah is the Light of the heavens and the earth.”
Quran 24:35
The Surah therefore contains powerful contrasts involving:
light and darkness,
guidance and misguidance,
clarity and confusion.
Quran 24:40 belongs within this broader spiritual message.
16. Science Can Help Us Appreciate the Imagery
Modern oceanography allows us to understand the physical environment of deep oceans much better than people could through ordinary observation from the shore.
We now know that:
sunlight decreases with depth,
deep waters can become completely dark,
the ocean contains layers of different densities,
and wave phenomena can occur beneath the surface.
These discoveries make the imagery of Quran 24:40 especially thought-provoking.
But they should deepen reflection—not replace the verse’s spiritual meaning.
17. Avoiding Exaggeration
When discussing scientific connections with the Quran, accuracy is essential.
We should not claim that Quran 24:40 contains a complete scientific theory of oceanography.
Nor should we say that ancient people knew absolutely nothing about darkness beneath water.
Instead, we can state what is genuinely remarkable:
The Quran uses an exceptionally vivid image of a deep sea, layers of waves, clouds, and multiple darknesses.
Modern oceanography reveals that deep oceans truly contain complex layers, wave phenomena, and environments where sunlight disappears.
That is worthy of reflection without exaggeration.
18. The Real Message: Without Allah’s Light
The end of Quran 24:40 brings us back to the central lesson:
“And whoever Allah does not bless with light will have no light.”
Quran 24:40
The verse ultimately concerns something greater than the physical ocean.
Just as a person in the deepest darkness cannot find their way without light, human beings need guidance.
For Muslims, that guidance comes from Allah.
Frequently Asked Questions
Which Quran verse mentions darkness in the deep sea?
The main verse is Quran 24:40 in Surah An-Nur.
Does sunlight reach the deepest ocean?
No. Sunlight is progressively absorbed and scattered as it travels through water. At sufficient depths, sunlight does not penetrate.
What are internal ocean waves?
Internal waves are waves that occur within the ocean, often along boundaries between water layers of different densities.
Does Quran 24:40 describe internal waves?
Some modern interpretations connect “waves upon waves” with internal waves. This is an interesting comparison, but the verse does not explicitly use modern oceanographic terminology.
What does “darkness upon darkness” mean?
Within the verse’s spiritual context, the expression illustrates profound darkness and lack of guidance. The physical imagery also corresponds naturally with the increasingly dark environment of deep water.
Is Quran 24:40 primarily a scientific verse?
No. Its primary context is spiritual. The deep-sea imagery is used as an analogy, although modern knowledge of the ocean makes the description particularly interesting to study.
Final Thoughts
The deep ocean is a world of extraordinary darkness, enormous pressure, hidden waves, and remarkable forms of life.
More than fourteen centuries ago, the Quran used the image of a deep sea covered by waves, waves above them, clouds, and:
“darkness upon darkness.”
Modern oceanography gives us fascinating new ways to appreciate this imagery.
But Quran 24:40 ultimately points toward a deeper lesson.
Physical darkness prevents the eyes from seeing.
Spiritual darkness prevents the heart from finding guidance.
And the verse concludes with a powerful reminder:
“And whoever Allah does not bless with light will have no light.”
Quran 24:40
Allah knows best.