"Or (the unbelievers’ state) is like the layers of darkness in a deep sea covered by waves topped by waves, topped by clouds: Layers of darkness, one above another. If a man stretches his hand, he can hardly see it. For any to whom Allah gives no light, there is no light.”(Quran 24: 40)
This is taken as knowledge of internal waves in the sea. But perhaps the waves on top of waves are the waves in the sky
Narrated AbuHurayrah
While Allah's Prophet (peace be upon him) and his companions were sitting clouds came over them and Allah's Prophet (peace be upon him) asked, "Do you know what these are?" On their replying that Allah and His Messenger knew best, he said, "These are the clouds (anan), these are the water-carriers of the Earth, which Allah drives to people who do not thank Him or call upon him." He then asked, "Do you know what is above you?" On their replying that Allah and His Messenger (peace be upon him) knew best, he said, "It is the firmament, a ceiling which is guarded and waves which are kept back."